Planted Aquarium Fertilizer FAQ
This page provides answers to common questions regarding planted aquarium fertilizers, PPS-Pro and EI dosing methods, liquid and dry fertilizers, aquarium micronutrients, iron supplementation, remineralization, and general planted aquarium nutrient management.
Quick Navigation
- Fertilizer Methods & Dosing Systems
- Dry vs Liquid Fertilizers
- Micronutrients & Iron
- Shrimp & Sensitive Aquariums
- RO/DI Water & Water Chemistry
- Fertilizer Troubleshooting
Fertilizer Methods & Dosing Systems
What is the difference between PPS-Pro and EI dosing?
PPS-Pro is generally considered a leaner daily fertilization approach designed around stable nutrient availability and reduced excess accumulation.
Estimative Index (EI) is a non-limiting fertilization approach that intentionally provides excess nutrients combined with scheduled water changes.
Both approaches can successfully support healthy planted aquariums when lighting, CO2, circulation, filtration, and maintenance are managed appropriately.
Additional PPS-Pro and EI dosing information is available in our Planted Aquarium Fertilizer Guide.
Can GLA Nectar AIO fertilizers be used in high-tech planted aquariums?
Yes. GLA Nectar AIO fertilizers can be used successfully in both beginner and advanced planted aquariums, including many high-light and CO2-injected systems.
Dosing levels should be adjusted based on plant mass, lighting intensity, CO2 injection, aquarium maintenance, and overall nutrient demand.
Lower dosing levels are commonly used in slower-growing or lower-energy planted aquariums, while higher dosing levels may be used in more demanding high-tech aquascapes with active CO2 injection and aggressive plant growth.
For aquarists seeking additional nutrient customization or independent macro and micronutrient control, separate GLA Nectar Macros and Micros fertilizers may also be appropriate.
Should I use GLA Nectar AIO or separate Macros & Micros fertilizers?
Both approaches can successfully support healthy planted aquariums, but the best choice depends on dosing preference, aquarium demands, and desired flexibility.
GLA Nectar AIO fertilizers combine macro and micronutrients into a single convenient solution designed for simplified dosing and everyday planted aquarium use.
Separate GLA Nectar Macros and Micros provide additional flexibility for aquarists who prefer independent nutrient adjustment, alternating dosing schedules, or higher-demand planted aquarium systems.
Many beginner and intermediate aquarists prefer AIO fertilizers for convenience, while many advanced aquascapers prefer separate macro and micronutrient control.
What is GLA Macromix and who is it designed for?
GLA Macromix is a professionally blended dry macronutrient fertilizer designed specifically for planted aquariums and modern aquascaping systems. It provides balanced nitrogen (NO₃), phosphorus (PO₄), potassium (K), and magnesium (Mg) for aquatic plant growth using PPS-Pro or Estimative Index (EI) fertilization methods.
GLA Macromix is designed for aquarists who want:
- Complete control over planted aquarium nutrient dosing
- Long-term dosing economy for medium to large aquariums
- The ability to prepare custom liquid stock solutions
- Compatibility with PPS-Pro and EI fertilization systems
- Stable nutrient delivery for both low-energy and high-tech CO2 aquariums
- Customizable nutrient dosing for different aquarium styles and plant demands
The formula may be used either:
- As a dry powder dosed directly into the aquarium
- Prepared as a liquid stock solution for PPS-Pro or EI dosing using RO or distilled water
GLA Macromix is formulated specifically for planted aquariums and contains balanced ratios of nitrate, phosphate, potassium, and magnesium derived from potassium nitrate, monopotassium phosphate, potassium sulfate, and magnesium sulfate.
For best results, GLA Macromix is commonly paired with GLA Micromix or GLA Micromix II to provide a complete planted aquarium macro and micronutrient fertilization system.
Additional PPS-Pro, EI, liquid stock preparation, and dosing guidance is available in the GLA Fertilizer Dosing Guide.
Do aquarium plants need fertilizers if I use aquasoil?
Yes. While many aquasoils contain nutrients that support early plant growth, most planted aquariums still benefit from ongoing fertilization over time.
Aquasoil nutrient content gradually becomes depleted as aquarium plants consume nutrients and as routine maintenance and water changes occur.
In many planted aquariums:
- Aquasoil primarily supports root feeding and initial nutrient availability
- Water column fertilizers help maintain ongoing macro and micronutrient availability
- Higher lighting and active CO2 injection generally increase long-term nutrient demand
The amount of additional fertilization required depends on:
- Plant mass and species selection
- Lighting intensity
- CO2 injection levels
- Aquasoil age and nutrient content
- Water change frequency
- Overall aquarium growth rate
Many planted aquariums achieve the best long-term stability through a combination of nutrient-rich substrate, stable CO2 availability, balanced water column fertilization, and consistent maintenance practices.
Dry vs Liquid Fertilizers
Should I use GLA dry fertilizers or GLA Nectar liquid fertilizers?
Both GLA dry fertilizers and GLA Nectar liquid fertilizers are designed for planted aquariums and can successfully support healthy aquatic plant growth when used appropriately.
The best choice depends primarily on aquarium size, dosing preference, maintenance style, and desired level of customization.
In general:
- GLA Nectar Liquid Fertilizers are ideal for aquarists seeking simple, convenient dosing with minimal preparation.
- GLA Dry Fertilizers are ideal for aquarists who want maximum flexibility, long-term economy, and the ability to customize nutrient dosing and stock solutions.
GLA Nectar liquid fertilizers are commonly preferred for:
- Simple daily dosing
- Convenience and ease of use
- Aquarists who prefer pre-mixed fertilizers
GLA dry fertilizers are commonly preferred for:
- High-demand planted systems
- Long-term dosing economy
- Custom PPS-Pro or EI dosing strategies
- Preparation of custom liquid stock solutions
Many aquascapers use dry fertilizers for their diy-approach & flexibility, while liquid fertilizers are often preferred for their simplicity and convenience.
Both approaches can produce excellent planted aquarium results when lighting, CO2, circulation, and overall aquarium stability are managed appropriately.
Additional fertilizer system information is available in our Planted Aquarium Fertilizer Guide.
Can dry fertilizers be used to make liquid stock solutions?
Yes. Many GLA dry fertilizers are designed for either direct dry dosing or preparation of liquid stock solutions.
Stock solutions are commonly used in PPS-Pro and EI dosing systems to simplify daily or scheduled nutrient dosing.
Micronutrients & Iron
What is the difference between GLA Micromix and GLA Micromix II?
GLA Micromix II is a copper-free trace fertilizer designed for aquarists seeking a trace mix without added copper.
Both trace mixes are designed specifically for planted aquarium use and may be used in a variety of planted aquarium dosing strategies.
Which aquarium iron fertilizer should I choose: Fe-EDTA, Fe-DTPA, or Fe-EDDHA?
The best iron fertilizer depends primarily on aquarium pH, lighting intensity, plant demand, and the desired level of iron stability within the aquarium water column.
Each iron chelate offers different characteristics and stability ranges:
- Fe-EDTA is commonly used in planted aquariums with lower to neutral pH ranges and is widely used for general planted aquarium fertilization.
- Fe-DTPA offers improved iron stability at moderately higher pH levels and is often preferred for high-light planted aquariums and aquascapes with stronger nutrient demand.
- Fe-EDDHA provides extremely strong iron stability at high pH levels but may tint aquarium water red or pink depending on dosage and aquarium conditions.
In general:
- Fe-EDTA is often suitable for softer, lower-pH planted aquariums.
- Fe-DTPA is commonly considered the best all-around choice for many high-tech planted aquariums due to its balance of stability and usability.
- Fe-EDDHA is typically reserved for specialized situations involving high pH water or severe iron availability limitations.
Aquarium plants absorb iron rapidly under strong lighting and active CO2 injection, so maintaining stable nutrient availability is often more important than simply increasing iron concentration.
Shrimp & Sensitive Aquariums
Can GLA fertilizers be used in shrimp aquariums?
GLA offers both standard and copper-free fertilizer options. Many aquarists successfully use aquarium fertilizers in shrimp aquariums; however, livestock sensitivity, dosing levels, and aquarium conditions may vary.
Careful dosing, stable aquarium conditions, and observation of livestock behavior are generally recommended when introducing fertilizers into sensitive planted aquariums.
GLA Micromix II and GLA Nectar AIO/S are designed for aquarists seeking copper-free planted aquarium fertilizer options.
RO/DI Water & Water Chemistry
Can I use RO/DI water in a planted aquarium?
Yes. Many planted aquarium hobbyists successfully use RO (Reverse Osmosis) or RO/DI (Reverse Osmosis Deionized) water either alone or blended with tap water.
Because RO/DI water contains very low mineral content, important minerals such as calcium, magnesium, and carbonate hardness are often reintroduced using remineralization products or aquarium mineral supplements.
RO/DI water may provide:
- Greater consistency and control over water chemistry
- Reduced unwanted contaminants
- Improved flexibility for sensitive aquatic plants or livestock
- More predictable fertilization and remineralization control
Stable remineralization and consistent maintenance practices are generally more important than pursuing extremely low TDS or overly aggressive water parameter adjustments.
Fertilizer Troubleshooting
Can I overdose aquarium fertilizers?
Yes. Excessive fertilization may contribute to nutrient imbalances, algae growth, livestock stress, or unnecessary nutrient accumulation depending on aquarium conditions and dosing practices.
However, healthy planted aquariums are typically influenced by the balance between lighting, CO2, circulation, nutrient availability, filtration, and maintenance rather than fertilizer dosing alone.
Many planted aquarium fertilization systems intentionally operate within stable nutrient ranges designed to support healthy plant growth while minimizing deficiencies and instability.
When adjusting fertilizer dosing, gradual changes combined with observation of plant growth, algae development, and livestock behavior are generally recommended.
Why are my aquarium plant leaves turning yellow?
Yellowing leaves may indicate nutrient deficiencies, poor nutrient availability, unstable CO2 levels, lighting imbalance, natural plant transition, or general aquarium instability.
Common causes may include:
- Nitrogen deficiency
- Iron or micronutrient deficiency
- Insufficient CO2 availability
- Old leaf deterioration
- Poor circulation
- Transition from emersed to submerged growth
Healthy planted aquariums are generally achieved through stable nutrient dosing, consistent CO2 availability, balanced lighting, and long-term aquarium stability rather than aggressive adjustments to a single parameter.
Experiencing plant health issues, algae growth, discoloration, melting, or nutrient deficiency symptoms in your planted aquarium?
Review our Planted Aquarium Troubleshooting Guide for detailed information covering nutrient deficiencies, aquarium plant health, algae problems, CO2 imbalance, circulation issues, and common planted aquarium troubleshooting strategies.
Why do my aquarium plants have holes in the leaves?
Small holes or deteriorating areas in aquarium plant leaves may be associated with nutrient deficiencies, aging leaves, physical damage, or general aquarium instability.
Common causes may include:
- Potassium deficiency
- Older leaf deterioration
- Mechanical damage
- Poor circulation
- Unstable CO2 levels
- Transition stress after planting
Older or damaged leaves may not fully recover even after aquarium conditions improve. Healthy new growth is generally a better indicator of long-term planted aquarium stability.
Why are my aquarium plants melting after planting?
Many aquatic plants experience temporary leaf loss or “melting” after being introduced into a new aquarium.
This commonly occurs as plants transition from emersed growth (grown above water) to submerged growth within the aquarium.
Additional causes may include:
- Changes in water chemistry
- Lighting adjustments
- CO2 instability
- Root disturbance
- Shipping stress
In many cases, healthy new submerged growth will gradually replace older leaves once the plant adapts to aquarium conditions.
Do fertilizers ship internationally?
Some fertilizers may be restricted from international shipment depending on destination country regulations and shipping carrier policies.
Additional international shipping information is available on our Shipping & Returns Support Page.
Need Additional Fertilizer Assistance?
If you need assistance selecting planted aquarium fertilizers, understanding PPS-Pro or EI dosing, choosing iron supplements, or troubleshooting planted aquarium nutrient issues, please contact Green Leaf Aquariums support.
We are happy to assist with:
- Dry and liquid fertilizer selection
- PPS-Pro and EI guidance
- Micronutrient and iron selection
- Stock solution preparation
- RO/DI remineralization questions
- General planted aquarium nutrient troubleshooting
Explore additional GLA planted aquarium guides, technical resources, and product information: