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Nature Aquarium Dry Fertilizer Dosing Guide, Dosing Charts & Calculator, & DIY Nutrient Strategies – PPS-Pro & Estimative Index (EI) Methods

Nature Aquarium Dry Fertilizer Dosing Guide, Dosing Charts & Calculator, & DIY Nutrient Strategies – PPS-Pro & Estimative Index (EI) Methods

Contents


PPS-Pro (Perpetual Preservation System) – GLA PPS-Pro Aquarium Fertilizer Package – N, P, K, Mg & GLA Micros

How to Dose PPS-Pro in Your Planted Aquarium

The PPS-Pro fertilizing system has been widely adopted and refined by the planted tank community. It is a cost-effective, science-based daily dosing method designed for CO₂-injected, planted aquariums with moderate bioloads. PPS-Pro promotes nourished & balanced growth by delivering adequate & precise, consistent daily doses of both macro- and micronutrients, — helping prevent deficiencies with precise nutrient amounts dosed in balance with plant growth/absorption, while limiting algae and minimizing testing.

Unlike other systems, PPS-Pro does not require frequent water testing or scheduled water changes. Instead, it uses TDS (total dissolved solids) readings as a general guide to nutrient accumulation. Its simplicity and proven results make it a favorite for aquascapers seeking long-term plant health without excessive intervention.

Before You Start – What You’ll Need

  • Digital scale (±0.01 g) – for accurate measurement of dry salts
  • Two clean 500 mL bottles with caps – one for Macros, one for Micros
  • RO or distilled water – ensures purity, reduces precipitation risk, and extends shelf life
  • Optional: TDS meter – to track conductivity and determine when to change water

Tips: Sanitize bottles before use (boil). Warm (not boiling) water speeds up salt dissolution during mixing. Never microwave plastic bottles.

PPS-Pro Macros & Micros Stock Solution Preparation (grams)

Macros Bottle – 500 mL

  • Potassium Nitrate (KNO₃) - 31g
  • Monopotassium Phosphate (KH₂PO₄) - 2.7g
  • Potassium Sulfate (K₂SO₄) - 28g
  • Magnesium Sulfate (MgSO₄·7H₂O) - 19g

Micros Bottle – 500 mL

  • GLA Micromix - 29g
    or
  • GLA Micromix II (Copper-Free) - 29g

Instructions:

  1. Weigh dry salts in grams (g) using a precision scale.
  2. Add measured dry salts to Macros and Micros 500 mL bottles accordingly, as outlined above.
  3. Fill bottles to the 500 mL line with RO or distilled water.
  4. Cap and shake vigorously to dissolve.
  5. Let rest 12–24 hours for full clarity.
  6. Store in a cool, dark place. Refrigeration is optional but recommended for micros longevity.

PPS-Pro Daily Dosing Instructions

Doses (mL) are based on tank volume per 10 gallons (40 L). Dose daily, ideally just before lights turn on.

PPS-Pro Light-Level Dosing Chart

Light Level Macros
(mL/per 10 gal)		 Micros
(mL/per 10 gal)		 Water Changes Daily PPM Weekly PPM
Low Light / Low Tech 0.5 mL (10 drops) 0.25 mL (5 drops) 50% weekly (optional) 0.5 NO₃, 0.05 PO₄, 0.67 K, 0.05 Mg, ~0.025 TE 3.5 NO₃, 0.35 PO₄, 4.7 K, 0.35 Mg, ~0.175 TE
Medium / High Light
(Standard PPS-Pro)		 1.0 mL (20 drops) 0.5 mL (10 drops) 50% weekly 1.0 NO₃, 0.10 PO₄, 1.33 K, 0.10 Mg, ~0.05 TE 7.0 NO₃, 0.70 PO₄, 9.3 K, 0.70 Mg, ~0.35 TE
Very High Light / High Tech 2.0 mL (40 drops) 1.0 mL (20 drops) 50% weekly 2.0 NO₃, 0.20 PO₄, 2.66 K, 0.20 Mg, ~0.10 TE 14.0 NO₃, 1.40 PO₄, 18.6 K, 1.40 Mg, ~0.70 TE

1 mL = 20 drops. Use a graduated pipette or medical dropper for precision.

Standard PPS-Pro Quick Reference – Daily Dosing (Medium/High Light Tanks)

  • Macros: 1.0 mL (20 drops) per every 10 gallons, yields a daily total: 1.0 ppm NO₃, 0.1 ppm PO₄, 1.33 ppm K, 0.1 ppm Mg
  • Micros: 0.5 mL (10 drops) per every 10 gallons, yields a daily total: ~0.05 ppm total trace elements (TE)

Dosing Adjustments:

  • Low light: Half dose
  • High light: Double dose
  • Dose once daily, before lights turn on

Important Notes on Trace Element Dosing

  • A 0.5 mL dose of GLA Micromix or Micromix II delivers ~0.05 ppm TE, aligning with the PPS-Pro weekly target of 0.35 ppm.
  • Optional: You may adjust the dose to 1.0 mL Micros daily (for simplicity and consistency with your Macros dose), yielding ~0.7 ppm TE/week — closer to Estimative Index (EI) levels.
  • To maintain the standard 0.35 ppm TE while dosing 1.0 mL, you can reduce the Micros recipe by half to 14.5 g during preparation of the 500 mL stock. This reduces weekly TE back to ~0.35 ppm while simplifying dosing volume to match Macros (1.0 mL each).

Monitoring Tank Health

  • New growth pale? Slightly increase Micros.
  • Algae appearing? Check CO₂ stability and reduce nutrient load if needed.
  • TDS rising steadily? Consider a 50% water change.
  • Never combine Macros and Micros — iron and phosphate can precipitate.

Macronutrient Stock Solution Breakdown

Salt Amount in 500 mL Nutrients Supplied Resulting PPM (1 mL dose per 10 gal)
KNO₃ 31.0 g NO₃, K 1.00 ppm NO₃, 0.63 ppm K
KH₂PO₄ 2.7 g PO₄, K 0.10 ppm PO₄, 0.04 ppm K
K₂SO₄ 28.0 g K 0.66 ppm K
MgSO₄·7H₂O 19.0 g Mg 0.10 ppm Mg
Totals 80.7 g NO₃, PO₄, K, Mg 1.00 NO₃ / 0.10 PO₄ / 1.33 K / 0.10 Mg

PPS-Pro Dosing Chart & Daily/Weekly PPM

Light Level / Tank Type Macros Dose (mL/10gal) Micros Dose (mL/10gal) NO₃
(Daily / Weekly)		 PO₄
(Daily / Weekly)		 K
(Daily / Weekly)		 Mg
(Daily / Weekly)		 Fe / TE
(Daily / Weekly)		 Tank Notes
Low Light / Low Tech 0.5 mL 0.25 mL 0.5 / 3.5 ppm 0.05 / 0.35 ppm 0.67 / 4.7 ppm 0.05 / 0.35 ppm ~0.025 / ~0.175 ppm Minimal CO₂ or low bioload
Medium / High Light 1.0 mL 0.5 mL 1.0 / 7.0 ppm 0.10 / 0.70 ppm 1.33 / 9.3 ppm 0.10 / 0.70 ppm ~0.05 / ~0.35 ppm Typical PPS-Pro baseline
Very High Light / High Tech 2.0 mL 1.0 mL 2.0 / 14.0 ppm 0.20 / 1.40 ppm 2.66 / 18.6 ppm 0.20 / 1.40 ppm ~0.10 / ~0.70 ppm High growth, full CO₂

Nutrient Breakdown by Tank Light Level

Low Light / Low Tech
  • NO₃: 0.5 ppm/day → 3.5 ppm/week
  • PO₄: 0.05 ppm/day → 0.35 ppm/week
  • K: 0.665 ppm/day → 4.7 ppm/week
  • Mg: 0.05 ppm/day → 0.35 ppm/week
  • Fe/TE: ~0.025 ppm/day → ~0.175 ppm/week
Medium / High Light
  • NO₃: 1.0 ppm/day → 7.0 ppm/week
  • PO₄: 0.1 ppm/day → 0.7 ppm/week
  • K: 1.33 ppm/day → 9.3 ppm/week
  • Mg: 0.1 ppm/day → 0.7 ppm/week
  • Fe/TE: ~0.05 ppm/day → ~0.35 ppm/week
Very High Light / High Tech
  • NO₃: 2.0 ppm/day → 14.0 ppm/week
  • PO₄: 0.2 ppm/day → 1.4 ppm/week
  • K: 2.66 ppm/day → 18.6 ppm/week
  • Mg: 0.2 ppm/day → 1.4 ppm/week
  • Fe/TE: ~0.10 ppm/day → ~0.70 ppm/week

Daily PPS-Pro Dosing Chart (Standard PPS - Medium/High Light Tanks)

Tank Size (gal) Macros (mL/day) Micros (mL/day)
5 gal 0.5 mL 0.25 mL
10 gal 1.0 mL 0.5 mL
15 gal 1.5 mL 0.75 mL
20 gal 2.0 mL 1.0 mL
30 gal 3.0 mL 1.5 mL
40 gal 4.0 mL 2.0 mL
50 gal 5.0 mL 2.5 mL
55 gal 5.5 mL 2.75 mL
60 gal 6.0 mL 3.0 mL
75 gal 7.5 mL 3.75 mL
90 gal 9.0 mL 4.5 mL
100 gal 10.0 mL 5.0 mL
125 gal 12.5 mL 6.25 mL
150 gal 15.0 mL 7.5 mL
180 gal 18.0 mL 9.0 mL
200 gal 20.0 mL 10.0 mL
220 gal 22.0 mL 11.0 mL
250 gal 25.0 mL 12.5 mL

TDS-Based Conductivity Targets – When to Change Water

Use a simple TDS meter to monitor nutrient buildup.

Rule of thumb:
Perform a 50% water change if:
Aquarium TDS (µS) > Tap water TDS + 100 µS

Example:
Tap = 300 µS → Change water if tank exceeds 400 µS

Optional: 50% Weekly Water Change Schedule

  • Dose Macros and Micros daily for 7 days
  • Perform 50% water change on day 7 or 8
  • Resume dosing same or next day


Estimative Index (EI) Dosing Method – GLA EI Aquarium Fertilizer Kit

What Is EI Dosing?

The Estimative Index (EI) is a high-nutrient fertilizing method developed to eliminate plant nutrient deficiencies by providing nutrients in non-limiting concentrations. The goal is to saturate the water column with ample nutrients, allowing plants to absorb freely without restriction. Any excess nutrients are removed via weekly 50% water changes, which resets the system and prevents accumulation.

EI assumes the following conditions:

  • A densely planted tank
  • High light levels
  • Consistent CO₂ at ~30 ppm (CO₂ injection required)

Water testing is not required. Instead, nutrient dosing follows a fixed schedule and emphasizes CO₂ stability, densely planted aquascape, healthy plant growth, and algae control.

It’s strongly recommended to use a CO₂ drop checker to confirm 30 ppm CO2 saturation.

How EI Works

  • Macros (NPK) are dosed on Mon, Wed, Fri
  • Micros (Fe/trace elements) are dosed on Tue, Thu, Sat
  • On Sunday, perform a 50% or greater water change

This alternating schedule ensures that macros and micros are never dosed on the same day, preventing unwanted interactions (e.g., phosphate and iron precipitation).

How to Dose Estimative Index Fertilizers – Dry Dosing Chart

Use precise aquarium-safe spoons. Dose directly into the aquarium on the appropriate day.

Tank Size KNO₃ KH₂PO₄ K₂SO₄ Micros
10–20 gal 1/8 tsp 1/32 tsp 1/32 tsp 1/32 tsp
20–40 gal 1/4 tsp 1/16 tsp 1/16 tsp 1/16 tsp
40–60 gal 1/2 tsp 1/8 tsp 1/8 tsp 1/8 tsp
60–80 gal 3/4 tsp 3/16 tsp 1/4 tsp 1/4 tsp
100–125 gal 1½ tsp 1/2 tsp 1/2 tsp 1/2 tsp
  • Dose macros 3×/week (Mon/Wed/Fri)
  • Dose micros 3×/week (Tue/Thu/Sat)
  • 50% water change every Sunday to reset nutrients

Summary: EI Dosing Schedule

Day Action
Mon Macros (NPK)
Tue Micros (TE)
Wed Macros (NPK)
Thu Micros (TE)
Fri Macros (NPK)
Sat Micros (TE)
Sun 50%+ Water Change


GLA Macros & Micros – Nature Aquarium Fertilizer Kit for EI & PPS-Pro

GLA Macromix & Micromix: 2-Part Nutrient System for Advanced Planted Aquarium Dosing

GLA’s Macromix + Micromix kit represents a professionally engineered fertilization system designed for aquascaping enthusiasts who demand rigorous control over nutrient delivery. Developed with precise molar ratios, verified chelate stability, and known ppm outputs, this system ensures consistent, predictable nutrition tailored to the metabolic needs of aquatic plants.

Whether you're running a low-tech tank using PPS-Pro or managing a high-demand CO₂-enriched aquascape using EI, the Macromix and Micromix system delivers transparent, repeatable results.

Why Use GLA Macromix + Micromix Kit?

GLA’s 2-part flexible dosing system simplifies routine fertilizing while delivering professional-level control over nutrient delivery in high- and low-tech aquascapes. Formulated from analytical-grade components in chelated, bioavailable forms, this system eliminates nutrient uncertainty and maximizes plant health.

  • ✔ Scientifically formulated for accurate, predictable dosing
  • ✔ Compatible with both lean and aggressive dosing strategies (PPS-Pro or EI)
  • ✔ Provides known ppm outputs per dose — no guessing
  • ✔ Works in both high-tech and balanced low-tech setups
  • ✔ Suitable for stock solution or dry dosing
  • ✔ Simplified Routine: Just two bottles — no multi-salt measuring required

Pro Tips for Best Results

  • Dose Macros in the morning before lights come on.
  • When using EI Alternating, dose Macros and Micros on separate days.
  • Adjust based on plant density, light intensity, and CO₂ levels.
  • For EI, perform 50%+ weekly water changes consistently (Sundays).
  • Never mix Macros and Micros in the same bottle.
Product Type Nutrients Delivered
Macromix Macronutrient Blend NO₃, PO₄, K, Mg
Micromix / Micromix II (Copper-free) Micronutrients / Chelated Trace Mix Fe-DTPA, Mn-EDTA, Zn-EDTA, B, *Cu-EDTA, Mo (Na₂MoO₄·2H₂O)

Dry Dosing vs. Liquid Stock – Which Should You Choose?

GLA Macromix and Micromix can be dosed either as dry powders or by preparing liquid stock solutions. Both approaches deliver the same nutrients, but each has distinct advantages depending on your aquarium size and dosing routine.

  • Liquid stock dosing involves pre-mixing your Macromix and Micromix powders into separate bottles using RO or distilled water. This method offers more precision, making it ideal for smaller tanks or when using automatic dosing systems. It also simplifies daily maintenance by allowing quick, measured liquid doses.
  • Dry dosing is the most direct, simplified method. It’s especially practical for medium to large tanks (typically 40 gallons or more), where slight measurement variations won’t significantly affect nutrient balance. Dry doses can be measured using a digital scale or leveled measuring spoons. Once weighed and confirmed, many aquarists assign a dedicated spoon for each product to streamline daily use.

Choose the method that best suits your tank size, workflow, and accuracy requirements. Dry dosing is perfect for simplicity and efficiency, while liquid stock gives you tighter control over exact nutrient delivery.

GLA Macros & Micros Kit – 500mL Liquid Stock Preparation

Product Weigh & mix this amount (grams) in 500 mL bottles with RO/DI water Dose per 10 gal Daily PPM Yield
GLA Macromix 82 g 1.0 mL 1.0 NO₃, 0.1 PO₄, 1.33 K, 0.1 Mg
GLA Micromix 29 g 0.5 mL ~0.05 ppm total trace elements
GLA Micromix II (No Copper) 29 g 0.5 mL ~0.05 ppm total trace elements

Instructions for Preparing Stock Solutions

  1. Weigh Accurately
    Use a precision digital scale (±0.01 g) to measure Macromix and Micromix (see grams listed above).
  2. Prepare Bottles
    Add dry fertilizer to sanitized 500 mL bottles.
  3. Add Water
    Fill to 500 mL with RO or distilled water.
  4. Dissolve Completely
    Shake well to mix. Warm water can speed up dissolution.
  5. Settle for Clarity
    Let sit 12–24 hours.
  6. Storage
    Store in a cool, dark place. Refrigeration optional, but helpful for longevity of micros.

Recommended Liquid Daily Dosing (per 10 gallons)

Method Macros Dose (mL/10 gal) Micros Dose (mL/10 gal)
PPS-Pro 1.0 mL 0.5 mL
EI Daily (Moderate) 2.0 mL 0.7 mL
EI Daily (Full) 4.0 mL 1.0 mL
EI Alternating (3×) 10.0 mL (M/W/F) 2.5 mL (T/Th/Sat)

Macros & Micros Kit – Liquid Dosing Reference - Daily & Weekly PPM

This chart summarizes daily and total weekly nutrient levels based on mL dosing per 10 gallons using prepared liquid stock solutions. EI Alternating assumes 3 macro and 3 micro doses per week, with a water change on Sunday.

Method Macros Dose
(mL/10 gal)		 Micros Dose
(mL/10 gal)		 Daily PPM
(NO₃ / PO₄ / K / Mg / Fe)		 Weekly PPM
(NO₃ / PO₄ / K / Mg / Fe)		 Notes
PPS-Pro (7×/week) 1.0 0.5 1.0 / 0.1 / 1.33 / 0.1 / 0.05 7.0 / 0.7 / 9.3 / 0.7 / 0.35 No water change required, monitor TDS
EI Daily (Moderate) 2.0 0.7 2.0 / 0.2 / 2.66 / 0.2 / 0.07 14.0 / 1.4 / 18.6 / 1.4 / 0.50 50%+ weekly water change
EI Daily (Full) 4.0 1.0 4.0 / 0.4 / 5.32 / 0.4 / 0.10 28.0 / 2.8 / 37.2 / 2.8 / 0.70 High light, high CO₂; 50%+ weekly WC
EI Alternating (3×/week) 10.0 (3× - M/W/F) 2.5 (3× - T/TH/Sat) 10.0 / 1.0 / 13.3 / 1.0 / 0.25 30.0 / 3.0 / 39.9 / 3.0 / 0.75 Macros Mon/Wed/Fri, Micros Tue/Thu/Sat, WC Sun

*EI Alternating: Macros on Mon/Wed/Fri, Micros on Tue/Thu/Sat, Water Change on Sunday

Daily PPM of Target Nutrients – Liquid Stock Dosing

Method Macros (mL/10 gal) Micros (mL/10 gal) NO₃ PPM PO₄ PPM K PPM Mg PPM Fe (TE) PPM
PPS-Pro (Balanced/Lean) 1.0 0.5 1.0 0.1 1.33 0.1 0.05
EI Daily (Moderate) 2.0 0.7 2.0 0.2 2.66 0.2 0.07
EI Daily (Full) 4.0 1.0 4.0 0.4 5.32 0.4 0.10
EI Alternating (3×/wk) 10.0 2.5 10 1.0 13.3 1.0 0.25

Weekly PPM Nutrient Totals – Liquid Stock Dosing

Method Dosing Frequency Weekly NO₃ PO₄ K Mg Fe / TE Notes
PPS-Pro Daily 1.0 mL Macros + 0.5 mL Micros × 7 7.0 0.7 9.3 0.7 0.35 Lean and consistent
EI Daily (Moderate) 2.0 mL Macros + 0.7 mL Micros × 7 14.0 1.4 18.6 1.4 0.50 Intermediate strength
EI Daily (Full) 4.0 mL Macros + 1.0 mL Micros × 7 28.0 2.8 37.2 2.8 0.70 High growth, daily precision
EI Alternating (3×/week) 10 mL Macros (3×) + 2.5 mL Micros (3×) 30.0 3.0 39.9 3.0 0.75 Fewer doses, same result

Daily Liquid Dosing Chart – GLA Macros & Micros Kit

Tank Size (gal) PPS-Pro
Macros (mL/day)		 PPS-Pro
Micros (mL/day)		 EI Moderate
Macros (mL/day)		 EI Moderate
Micros (mL/day)		 EI Full
Macros (mL/day)		 EI Full
Micros (mL/day)		 EI Alternating
Macros (mL) 3×/week		 EI Alternating
Micros (mL) 3×/week
5 0.5 0.25 1.0 0.35 2.0 0.5 5.0 1.25
10 1.0 0.5 2.0 0.7 4.0 1.0 10.0 2.5
15 1.5 0.75 3.0 1.05 6.0 1.5 15.0 3.75
20 2.0 1.0 4.0 1.4 8.0 2.0 20.0 5.0
30 3.0 1.5 6.0 2.1 12.0 3.0 30.0 7.5
40 4.0 2.0 8.0 2.8 16.0 4.0 40.0 10.0
50 5.0 2.5 10.0 3.5 20.0 5.0 50.0 12.5
55 5.5 2.75 11.0 3.85 22.0 5.5 55.0 13.75
60 6.0 3.0 12.0 4.2 24.0 6.0 60.0 15.0
75 7.5 3.75 15.0 5.25 30.0 7.5 75.0 18.75
90 9.0 4.5 18.0 6.3 36.0 9.0 90.0 22.5
100 10.0 5.0 20.0 7.0 40.0 10.0 100.0 25.0
125 12.5 6.25 25.0 8.75 50.0 12.5 125.0 31.25
150 15.0 7.5 30.0 10.5 60.0 15.0 150.0 37.5
180 18.0 9.0 36.0 12.6 72.0 18.0 180.0 45.0
200 20.0 10.0 40.0 14.0 80.0 20.0 200.0 50.0
220 22.0 11.0 44.0 15.4 88.0 22.0 220.0 55.0
250 25.0 12.5 50.0 17.5 100.0 25.0 250.0 62.5

Note: Based on GLA Macromix (82g/500mL) and Micromix (29g/500mL) stock solution recipes. Dose once daily (PPS-Pro or EI Daily), or 3×/week for EI Alternating. Adjust for plant mass, light, and CO₂ stability as needed.

Macros & Micros Kit - Dry Dosing Reference (per 10 gallons)

(Measured in grams per dose)

Method Macromix (g) Micromix (g) Weekly PPM (NO₃ / PO₄ / K / Mg / TE)
PPS-Pro Daily 0.164 g/day 0.029 g/day 7 / 0.7 / 9.3 / 0.7 / 0.35
EI Daily (Moderate) 0.328 g/day 0.044 g/day 14 / 1.4 / 18.6 / 1.4 / 0.49
EI Daily (Full) 0.656 g/day 0.058 g/day 28 / 2.8 / 37.2 / 2.8 / 0.70
EI Alternating (3×/wk) 1.64 g × 3×/wk 0.145 g × 3×/wk 30 / 3.0 / 39.9 / 3.0 / 0.75

Note: Dry dosing is best for tanks ≥40 gallons. For smaller tanks, use liquid dosing to ensure accuracy.

Daily Dry Dosing Chart – GLA Macros & Micros Kit (grams)

Measured per tank size for PPS-Pro and Estimative Index (EI) methods using dry powders. For optimal accuracy, use a digital scale.

Tank Size (gal) PPS-Pro Macros (g/day) PPS-Pro Micros (g/day) EI Moderate Macros (g/day) EI Moderate Micros (g/day) EI Full Macros (g/day) EI Full Micros (g/day) EI Alt Macros (g) 3×/wk EI Alt Micros (g) 3×/wk
5 0.082 0.015 0.164 0.022 0.328 0.029 0.82 0.073
10 0.164 0.029 0.328 0.044 0.656 0.058 1.64 0.145
15 0.246 0.044 0.492 0.066 0.984 0.087 2.46 0.218
20 0.328 0.058 0.656 0.088 1.312 0.116 3.28 0.290
30 0.492 0.087 0.984 0.132 1.968 0.174 4.92 0.435
40 0.656 0.116 1.312 0.176 2.624 0.232 6.56 0.580
50 0.820 0.145 1.640 0.220 3.280 0.290 8.20 0.725
55 0.902 0.160 1.804 0.242 3.608 0.319 9.02 0.798
60 0.984 0.174 1.968 0.264 3.936 0.348 9.84 0.870
75 1.230 0.218 2.460 0.330 4.920 0.435 12.30 1.088
90 1.476 0.261 2.952 0.396 5.904 0.522 14.76 1.305
100 1.640 0.290 3.280 0.440 6.560 0.580 16.40 1.450
125 2.050 0.362 4.100 0.550 8.200 0.725 20.50 1.813
150 2.460 0.435 4.920 0.660 9.840 0.870 24.60 2.175
180 2.952 0.522 5.904 0.792 11.808 1.044 29.52 2.610
200 3.280 0.580 6.560 0.880 13.120 1.160 32.80 2.900
220 3.608 0.638 7.216 0.968 14.432 1.276 36.08 3.190
250 4.100 0.725 8.200 1.100 16.400 1.450 41.00 3.625

Dry Dosing Reference – Spoon Sizes, Weights, and Tank Volumes

Tip: Use a digital scale to weigh your first doses of Macromix and Micromix. Once confirmed, you can assign each to a dedicated spoon and reuse those same leveled spoonfuls for consistent daily dosing.

Never share spoons between Macros and Micros — they differ in density and weight, and small tanks are especially sensitive to micronutrient variation.

Note: You may round to the nearest spoon size, but a digital scale is always more accurate. Avoid heaping spoons. Always level.

Spoon Dosing Reference for PPS-Pro, EI Moderate, & EI Full

Daily Dosing Range: PPS-Pro → EI Moderate → EI Full
(For 7×/week dosing methods)

GLA Macromix – Daily Dose Range by Tank Size (Grams & Spoons)

Tank Size Dose Range (g) Approximate Spoon Size
5 gal 0.08 – 0.33 g 1/64 tsp or less
10 gal 0.16 – 0.66 g 1/64 – 1/16 tsp
15 gal 0.25 – 0.98 g 1/32 – 1/8 tsp
20 gal 0.33 – 1.31 g 1/32 – 1/8 tsp
30 gal 0.49 – 1.97 g 1/16 – 1/4 tsp
40 gal 0.66 – 2.62 g 1/8 – 1/4 tsp
50 gal 0.82 – 3.28 g 1/8 – 1/4+ tsp
75 gal 1.23 – 4.92 g 1/4 – 1/2 tsp
100 gal 1.64 – 6.56 g 1/2 tsp

GLA Micromix – Daily Dose Range by Tank Size (Grams & Spoons)

Tank Size Dose Range (g) Approximate Spoon Size
5 gal 0.015 – 0.029 g 1/64 tsp (very level)
10 gal 0.029 – 0.058 g 1/64 – 1/32 tsp
15 gal 0.044 – 0.087 g 1/64 – 1/32 tsp
20 gal 0.058 – 0.116 g 1/32 tsp
30 gal 0.087 – 0.174 g 1/32 – 1/16 tsp
40 gal 0.116 – 0.232 g 1/16 tsp (light–full)
50 gal 0.145 – 0.290 g 1/4 tsp (light)
75 gal 0.218 – 0.435 g 1/4 – 1/2 tsp
100 gal 0.290 – 0.580 g 1/2 tsp (level)

Spoon Dosing Reference for EI Alternating Dosing (3×/week)

Use Macros on Monday/Wednesday/Friday, and Micros on Tuesday/Thursday/Saturday. Water changes are typically performed Sunday.

GLA Macromix – Per Dose (3×/week)

Tank Size Per Dose (g) Approx. Spoon Size
5 gal 0.82 g 1/8 tsp
10 gal 1.64 g 1/4 tsp
20 gal 3.28 g 1/2 tsp
40 gal 6.56 g 1 tsp
75 gal 12.30 g 1 tsp (heaping)

GLA Micromix – Per Dose (3×/week)

Tank Size Per Dose (g) Approx. Spoon Size
5 gal 0.073 g 1/64 – 1/32 tsp
10 gal 0.145 g 1/16 tsp
20 gal 0.290 g 1/4 tsp (light)
40 gal 0.580 g 1/2 tsp (level)
75 gal 1.088 g 3/4 tsp

Notes & Best Practices

  • Use a digital scale to verify your first dose (±0.01 g accuracy recommended).
  • Once verified, use a consistent spoon for each product — never interchange.
  • Always level spoons; do not guess or heap, especially with Micromix.
  • Never mix Macros and Micros in the same container.
  • Dose Macros in the morning before lights come on.
  • For EI Alternating: Macros and Micros must be dosed on separate days.
  • Weekly 50%+ water changes are essential for EI dosing systems.

Dry Dosing Formula – Calculate Your Dose (in grams)

Use the formulas below to calculate how much GLA Macromix and GLA Micromix to dose for your tank size and chosen method.

Macromix (Grams per Dose)

  • PPS-Pro (daily): Tank Size × 0.0164
  • EI Moderate (daily): Tank Size × 0.0328
  • EI Full (daily): Tank Size × 0.0656
  • EI Alternating (3×/week): Tank Size × 0.164

Micromix (Grams per Dose)

  • PPS-Pro (daily): Tank Size × 0.0029
  • EI Moderate (daily): Tank Size × 0.0044
  • EI Full (daily): Tank Size × 0.0058
  • EI Alternating (3×/week): Tank Size × 0.0145

Example – 20 Gallon Tank (EI Alternating, 3×/week)

  • Macromix: 20 × 0.164 = 3.28 g (dose on Mon/Wed/Fri)
  • Micromix: 20 × 0.0145 = 0.29 g (dose on Tue/Thu/Sat)

Example – 20 Gallon Tank (EI Moderate)

  • Macromix = 20 × 0.0328 = 0.656 g/day
  • Micromix = 20 × 0.0044 = 0.088 g/day


    PPS-Pro vs. Estimative Index vs. GLA Macromix & Micromix — Which One Is Right for You?

    How Do I Choose Between PPS-Pro and EI Dosing?

    Both PPS-Pro and Estimative Index (EI) are proven nutrient delivery systems for planted aquariums. Your choice depends on your tank’s setup, plant species, and maintenance preferences.

    • PPS-Pro is ideal for tanks with lower light, moderate CO₂, and steady-state scapes. It delivers lean, daily nutrients with minimal waste and does not require water changes, unless TDS rises significantly.
    • EI is suited for high-energy tanks with strong lighting, CO₂ injection, and fast-growing plants. It provides nutrients in excess, with weekly 50% water changes to remove the surplus.
    Method Best For Frequency Water Changes Testing Nutrient Load
    PPS-Pro Low-tech tanks, slow growers, tanks with increased hardscape Daily Optional (TDS-based) Minimal (TDS) Lean & balanced
    EI High-light, CO₂-injected tanks, heavily planted, faster growth Daily or 3×/week Required (50%+) Optional Nutrient-rich, saturated

    Choosing the Right Dosing Method

    Feature PPS-Pro Estimative Index (EI)
    Dose Frequency Daily Daily or Alternating Days (3× Macros / 3× Micros weekly)
    Water Changes Optional (monitor TDS) Required (50% weekly or more)
    Nutrient Levels Lean, balanced High, nutrient-rich water column
    CO₂ Injection Recommended Required
    Tank Type Low to medium light High light, high-growth setups
    Scape Type Balanced, slow-growing species Dense plant mass, carpeting, rapid growth
    Testing Minimal (TDS monitoring) Optional (not required, visual observation preferred)
    Dosing Format Liquid or dry Liquid or dry


    Which GLA Fertilizer Package Should I Buy?

    We offer three complete DIY nutrient packages tailored to the most widely used planted aquarium fertilizing methods: PPS-Pro, Estimative Index (EI), and hybrid systems. Each kit includes all the dry fertilizers needed to prepare stock solutions or dry dose by tank size.

    Your choice depends on:

    • Lighting intensity
    • CO₂ injection
    • Plant density
    • Water change preferences
    • Livestock sensitivity

    GLA PPS-Pro Aquarium Fertilizer Package

    A lean daily dosing method designed for CO₂-injected aquariums with medium to high light and a stable aquascape. PPS-Pro delivers balanced nutrients with minimal waste and no required water testing. Nutrients are dosed from two easy-to-prepare stock bottles.

    Each package includes dry ingredients to prepare:

    • 1× Macros Bottle (500 mL) – Nitrate, phosphate, potassium, magnesium
    • 1× Micros Bottle (500 mL) – Iron and other trace elements

    Individual Salts Format – Full Control Over Ingredients

    Choose this format if you prefer to measure and mix each nutrient salt individually using the original PPS-Pro recipe.

    Package Includes:

    • 1 lb each of: KNO₃, KH₂PO₄, K₂SO₄, MgSO₄·7H₂O
    • 0.5 lb GLA Micromix (standard trace blend with copper)

    Best for experienced hobbyists who want granular control and maximum refill capacity. Makes many batches of 500 mL Macros and Micros stock solutions.

    Dosing: 1 mL Macros + 0.5 mL Micros per 10 gallons daily

    Water changes: Optional (based on TDS or preference)

    Available Versions:

    GLA Macros & Micros Fertilizer Package – Macromix + Micromix

    A highly flexible 2-part kit that works with PPS-Pro or Estimative Index (EI). Instead of measuring individual salts, you'll prepare two simple stock solutions using pre-blended nutrients — perfect for convenience without compromising precision.

    Includes:

    • 1 lb GLA Macromix – A complete blend of KNO₃, KH₂PO₄, K₂SO₄, MgSO₄
    • 0.5 lb GLA Micromix or Micromix II – Complete trace element blend

    Just weigh, mix with 500 mL RO or distilled water, and shake.

    Works for daily or alternating-day EI dosing, as well as PPS-Pro.

    Dosing Examples:

    • PPS-Pro: 1.0 mL Macromix + 0.5 mL Micromix per 10 gal
    • EI Daily (Full): 4.0 mL Macromix + 1.0 mL Micromix per 10 gal
    • EI Alternating: 10.0 mL Macromix (M/W/F), 2.5 mL Micromix (T/Th/Sat)

    Available Versions:

    GLA Estimative Index (EI) Aquarium Nutrients Package

    Designed specifically for the classical EI method, this package supports high-light, CO₂-injected aquariums with fast-growing plants. It follows the full EI routine: 6 nutrient doses per week, followed by a 50% water change day 7.

    Includes:

    • Pre-weighed NPK salts (KNO₃, KH₂PO₄, K₂SO₄)
    • GLA Micros (trace elements)

    Dosing:

    • Macros 3×/week (Mon/Wed/Fri)
    • Micros 3×/week (Tue/Thu/Sat)
    • 50%+ water change on Sunday

    Available Versions:

    Note: A copper-free version of the EI package is not currently offered.

    Which Version Should I Choose?

    All GLA fertilizer packages support preparation of 500 mL stock bottles and follow the same per-10-gallon dosing structure. Whether you’re new to planted tanks or running a high-end aquascape, there’s a GLA nutrient system to match your needs.

    Preference Recommended Package
    Full ingredient control PPS-Pro Individual Salts Package
    Simplified mixing, no measuring four salts Pre-Blended Macros & Micros (Macromix + Micromix)
    EI-style, alternating-day dosing Estimative Index (EI) Nutrients Package
    Maximum quantity for value Bag format
    Clean, reusable containers Jar format
    Shrimp-safe, no copper Micromix II (Copper-Free) (available in both PPS-Pro and Macros packages)
    Method Dose Frequency Weekly NO₃ PO₄ K Mg Fe (est.) Notes
    PPS-Pro Daily (7×/week) 7.0 ppm 0.7 9.3 0.7 ~0.35 ppm Lean, balanced, low waste
    Estimative Index (EI) Daily or Alternating Days (Micros 3x, Macros 3x, WC Day 7) ~30.0 ppm ~3.0 ~39.9 ~3.0 ~0.75 ppm High nutrient availability, increased tank maintenance & monitoring


    Frequently Asked Questions (FAQs)

    Q: What’s the difference between Macromix and Micromix?

    Macromix supplies macronutrients — nitrogen (NO₃), phosphorus (PO₄), potassium (K), and magnesium (Mg) — essential for plant growth and metabolism.

    Micromix delivers trace elements — including iron (Fe-DTPA), manganese (Mn), zinc (Zn), boron (B), copper (Cu, or none in Micromix II), and molybdenum (Mo) — required in small amounts for enzymatic function and chlorophyll synthesis.

    Q: How long does one 500 mL stock bottle last?

    For a 20-gallon aquarium:

    • Macromix: 1 mL/day = 250 doses → 250 days
    • Micromix: 0.5 mL/day = 500 doses → 500 days

    Note: EI methods use larger daily doses and will consume the solution more quickly.

    Q: How many 500 mL bottles can I make from one jar or bag?

    For Macros & Micros Sets:

    • GLA Macromix (1 lb / 454 g) → ~5.5 bottles (82 g per 500 mL)
    • GLA Micromix (0.5 lb / 227 g) → ~7.8 bottles (29 g per 500 mL)

    Q: Can I use GLA Macros & Micros for both PPS-Pro and EI?

    Yes. These sets are fully compatible with both PPS-Pro (lean daily dosing) and Estimative Index (EI) (daily or alternating-day dosing). Just follow the appropriate dosing chart.

    Q: Should I refrigerate the stock bottles?

    Refrigeration is optional. Store bottles in a cool, dark location.
    Chilling can help maintain micronutrient clarity over time. Always sanitize bottles before use to prevent contamination.

    Q: Can I combine macros and micros in one bottle?

    No. Never mix macros and micros together.
    Phosphate (from KH₂PO₄) and iron (Fe) can react and precipitate, rendering nutrients unavailable. Keep them in separate bottles.

    Q: Can I use GLA Macromix and Micromix together?

    Yes — they are designed to work together.

    For example, in PPS-Pro:

    • Dose 1.0 mL/day Macromix
    • Dose 0.5 mL/day Micromix

    This combination delivers a complete and balanced nutrient profile for aquatic plants.

    Q: Is this system shrimp-safe?

    Yes. The standard GLA Micromix contains <0.001% copper per dose, far below toxicity thresholds for shrimp and invertebrates.

    For ultra-sensitive setups, choose Micromix II (Copper-Free) — it contains no copper and is preferred for shrimp, snails, and ornamental invertebrates.

    Q: Can I scale the recipe to a smaller bottle size?

    Yes. For a 250 mL bottle, use:

    • Macromix: 41 g
    • Micromix: 14.5 g

    Keep the same daily dosing rate:

    • 1.0 mL Macros
    • 0.5 mL Micros per 10 gallons

    Q: What’s the benefit of DTPA-chelated iron?

    Fe-DTPA remains stable up to ~pH 7.5, making it ideal for most freshwater aquariums. It improves iron solubility and availability, reducing deficiency risk.

    DTPA is a medium-strength chelator, effective across a wide pH range, and compatible with typical aquarium lighting and water parameters.

    Q: Are water changes required?

    • PPS-Pro: Water changes are optional and based on conductivity (TDS) or tank needs.
    • EI: Requires 50%+ water changes weekly to prevent nutrient accumulation and reset the system.

    Q: Can I dose dry instead of using liquid stock?

    Yes, but dry dosing is only recommended for tanks ≥40 gallons.

    Smaller tanks benefit from liquid dosing for greater precision and stability.

    Dry dosing requires:

    • Accurate milligram-scale
    • Familiarity with teaspoon-to-gram conversions

    Dry Dosing vs. Liquid Stock – Which Should You Choose?

    GLA Macromix and Micromix can be dosed directly as dry powders or pre-mixed into liquid stock solutions for more precise delivery.

    • Dry dosing is fast and convenient for larger aquariums (40+ gallons), where small measuring errors have less impact. Use a digital scale or leveled measuring spoon for best accuracy.
    • Liquid stock dosing is ideal for smaller tanks or when ultra-precise daily delivery is needed. It also allows for easy automation with dosing pumps or syringes.

    Both methods deliver the same nutrients — choose the approach that fits your tank size, workflow, and accuracy needs.

    Q: How do I scale the dose for larger or smaller tanks?

    Doses scale linearly with tank volume:

    • 5 gal tank → Use ½ the standard dose
    • 20 gal tank → Use 2× standard dose
    • 40 gal tank → Use 4× standard dose

    Applies to both dry and liquid dosing methods.


    Choosing the Right Iron Chelate for Your Aquarium

    Iron (Fe) is a critical micronutrient in planted aquariums, but not all iron sources are the same. The form of iron chelate you use affects how well it remains available to plants—especially across different pH levels.

    Below is a side-by-side comparison of the three most common iron chelates used in planted tanks:

    Iron Chelate Comparison Table

    Chelate Type Iron Content Effective pH Range Stability at High pH Color in Solution Best For Notes
    Fe-EDTA 13% pH 4 – 6.5 Low – degrades above pH 6.5 Light yellow Soft water, low-pH tanks Common in basic micro mixes. Fast-acting but short-lived at higher pH.
    Fe-DTPA 11% pH 4 – 7.5 Moderate – stable up to pH 7.5 Light orange Most tap water setups Good all-around option for moderately hard/neutral water.
    Fe-EDDHA (o-o) 6% (5.2% o-o isomer) pH 4 – 9+ High – highly stable even in alkaline water Deep red/purple High-pH, hard water, or iron-deficient tanks Remains available even in high pH or GH setups. Ortho-ortho isomer is key.

    Quick Tips for Use

    • Fe-EDTA is ideal if you’re using RO/DI water or buffering your tank to acidic levels.
    • Fe-DTPA is the most balanced chelate for general use in neutral tap water.
    • Fe-EDDHA is the best choice if your pH is above 7.5 or if you’re struggling with iron deficiency despite regular dosing.


    General Hardness (GH) Booster – Calcium & Magnesium Remineralizer

    GLA's Ultimate GH Booster is a clean, balanced dry blend of calcium and magnesium designed to raise general hardness (GH) in softwater planted aquariums. It is ideal for remineralizing RO/DI water and restoring essential hardness for both aquatic plants and livestock.

    Formulated with fully soluble calcium sulfate and magnesium sulfate in a 3:1 Ca:Mg ratio, this GH booster supports:

    • Osmoregulation in fish, shrimp, and plants
    • Root and shoot development via calcium-based cell walls
    • Chlorophyll production and enzyme activity through magnesium

    Why Remineralize RO/DI Water?

    Without GH, even perfectly balanced NPK and micronutrient dosing can fall short. Calcium and magnesium are co-factors in nutrient uptake and must be present to enable proper transport and absorption of fertilizers. RO/DI water is stripped of all minerals — GH Booster replenishes what’s essential, without altering carbonate hardness (KH) or pH.

    Safe for Shrimp and Softwater Species

    GLA GH Booster is free of sodium and trace additives, making it a safe, stable solution for Caridina and Neocaridina shrimp, as well as other mineral-sensitive species. The Ca:Mg ratio of ~3:1 promotes healthy molting, strong exoskeleton development, and reproductive success.

    Dosing Instructions

    Use 1 tsp (3.5g) per 10 gallons RO/DI water to raise GH by approximately 3°dGH. Dissolve before adding to tank or add directly into new water during water changes.

    Suggested Dosing Reference

    Dose GH Increase (°dGH) Tank Volume
    1 tsp (3.5g) +3°dGH 10 gallons
    ½ tsp (1.75g) +1.5°dGH 10 gallons
    ⅛ tsp (0.44g) +1°dGH 5 gallons

    What Makes GLA GH Booster Different?

    • No sodium, carbonates, or filler ingredients
    • 100% soluble and pH-neutral
    • Only Ca and Mg — no micros or macros to interfere with your fertilizing strategy

    Whether you're following PPS-Pro, Estimative Index (EI), or a custom dry dosing system, GLA GH Booster ensures your water has the foundational minerals required for a thriving aquascape.


    Aquatic Plant Nutrients: Sources, Targets, Deficiencies, and Mobility

    Achieving optimal plant growth and algae control in a planted aquarium starts with understanding the nutrient demands of aquatic plants. These nutrients come from the water column, substrate, and biological cycling within the tank.

    1. Categories of Plant Nutrients

    Non-Mineral Nutrients

    These elements are absorbed from air and water and are directly involved in photosynthesis:

    • Hydrogen (H) – from H₂O
    • Oxygen (O) – from H₂O and air
    • Carbon (C) – from CO₂ injection or respiration

    Macronutrients

    Required in large quantities for energy transfer, cellular function, and overall growth. Divided into:

    Primary Macronutrients:

    • Nitrogen (N)
    • Phosphorus (P)
    • Potassium (K)

    Secondary Macronutrients:

    • Magnesium (Mg)
    • Calcium (Ca)
    • Sulfur (S)

    Micronutrients (Trace Elements)

    Needed in very small amounts, but crucial for enzyme activation, nutrient transport, and photosynthesis:

    • Iron (Fe)
    • Manganese (Mn)
    • Zinc (Zn)
    • Boron (B)
    • Copper (Cu)
    • Molybdenum (Mo)
    • Nickel (Ni)

    2. Weekly Target Nutrient Levels and Common Sources

    Nutrient Target Range (ppm) Common Sources
    CO₂ (Carbon) 30 ppm CO₂ injection
    Nitrogen (N) 5–30 ppm KNO₃, fish waste, decay
    Phosphorus (P) 0.5–3 ppm KH₂PO₄, fish waste, tap water
    Potassium (K) 10–40 ppm KNO₃, KH₂PO₄, K₂SO₄
    Magnesium (Mg) 5–10 ppm MgSO₄·7H₂O, tap water
    Calcium (Ca) 20–30 ppm Tap water, CaSO₄
    Trace Elements (TE) 0.05–1 ppm GLA Micromix, commercial TE mixes

    Example Daily Dose:
    ~1.0 ppm NO₃, 0.1 ppm PO₄, 1.33 ppm K, 0.1 ppm Mg, 0.05 ppm Fe

    3. Nutrient Balance & Interactions

    Nutrient ratios must remain balanced to avoid deficiencies and toxicities:

    • Excess phosphorus (P) may inhibit zinc (Zn) uptake
    • High potassium (K) can suppress magnesium (Mg), and vice versa
    • Excess calcium (Ca) may reduce boron (B) and magnesium availability
    • Elevated NO₃ and PO₄ can buffer trace element toxicity by increasing plant uptake

    Algae outbreaks are typically caused not by nutrient abundance, but by imbalances, unstable CO₂, or low plant mass.

    4. Deficiency Symptoms in Aquarium Plants

    Nutrient Deficiency Symptoms
    Nitrogen (N) Yellowing of older leaves along midvein (chlorosis), pale new growth, leaf drop
    Phosphorus (P) Reddish/purple leaf edges, poor root growth, stunted development
    Potassium (K) Yellow leaf margins and veins, pinholes, crinkled older leaves
    Magnesium (Mg) Pale older leaves, slow growth
    Calcium (Ca) Deformed, pale new leaves; stunted tips; brittle or melting tissue

    5. Nutrient Mobility in Plants

    Nutrient mobility describes whether a plant can relocate an element from older to newer tissues. This helps diagnose deficiencies based on where symptoms appear.

    Mobile Nutrients

    Deficiency symptoms show in older leaves first:

    • Nitrogen (N)
    • Phosphorus (P) – somewhat mobile
    • Potassium (K) – very mobile
    • Magnesium (Mg) – somewhat mobile
    • Sulfur (S)

    Immobile Nutrients

    Deficiency symptoms show in new growth first:

    • Calcium (Ca)
    • Boron (B)
    • Iron (Fe)
    • Manganese (Mn)
    • Zinc (Zn)
    • Molybdenum (Mo)
    • Copper (Cu)

    6. Typical Weekly Nutrient Targets – Nature Aquarium Dosing

    Parameter Target Range
    CO₂ 30 ppm
    NO₃ 5–30 ppm
    PO₄ 0.5–3.0 ppm
    K 10–40 ppm
    Fe (Iron) 0.05–1 ppm
    GH (General Hardness) 3–5° (~50+ ppm)
    KH (Carbonate Hardness) 3–5°
     
     

    Rotala Butterfly DIY Dry & Liquid Fertilizer Nutrient Dosing Calculator for Nature Aquarium Tank

    16th Dec 2019

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