Description
GLA GRO Planted Aquarium CO2 Regulator
The GLA GRO CO2 Regulator is a compact, precision-built single-stage regulator designed for dependable CO2 control in planted aquariums. Its streamlined configuration combines precise CO2 adjustment, automatic operation, integrated system protection, and GLA build quality in a clean, space-efficient platform.
Built with premium pneumatic components, each GLA GRO regulator is individually inspected, pressure tested, and leak checked in the USA prior to shipment.
At a Glance
- Pressure Regulation: Single-stage
- Cylinder Connection: CGA-320 standard USA CO2 cylinders
- Pressure Monitoring: Integrated working-pressure gauge
- Output Pressure Range: 0–70 PSI
- Standard Configuration: Single aquarium
- Expansion: Compatible with the optional GLA GRO CO2 Splitter
- Automation: Integrated electric solenoid
- Warranty: GLA Limited Lifetime Warranty
Best For
- Single planted aquarium CO2 installations
- Aquarists seeking a compact and straightforward regulator platform
- Installations where space and clean equipment layout are priorities
- Hobbyists who want precise CO2 adjustment with automatic timer control
- Planted aquariums using diffusers, inline atomizers, or CO2 reactors
For aquarists who prefer dual-stage pressure regulation or a fully modular manifold platform, the GLA DS-Mini and PRO-DS regulator families provide additional configuration options.
Why Choose the GLA GRO?
The GRO is designed around simplicity without sacrificing the precision components that matter in a pressurized planted aquarium CO2 system. It provides the essential control, automation, and protection required for dependable day-to-day CO2 operation without the larger footprint of a modular dual-stage regulator.
- Compact Single-Stage Design: Streamlined configuration for clean, efficient installation
- Precision CO2 Adjustment: Fine-control needle valve allows careful tuning of CO2 output
- Automatic Operation: Integrated solenoid allows CO2 injection to be controlled by a timer or compatible controller
- Integrated Flow Monitoring: Bubble counter provides a convenient visual reference for CO2 delivery
- Backflow Protection: Integrated check valve helps protect the CO2 system from aquarium water backflow
- System Protection: Integrated pressure relief valve provides an additional level of protection
Precision Control & Automation
The GLA GRO combines a precision needle valve, electric solenoid, and integrated bubble counter into a compact regulator assembly designed specifically for planted aquarium CO2 use.
The integrated working-pressure gauge provides a clear visual reference for regulator output pressure. The needle valve provides fine adjustment of CO2 flow, while the solenoid allows injection to be automatically coordinated with the aquarium photoperiod using a timer or compatible controller. The integrated bubble counter provides a convenient repeatable reference when tuning the system.
Bubble rate should be treated as an aquarium-specific reference rather than a universal CO2 measurement. Actual CO2 requirements vary with aquarium volume, plant mass, lighting, circulation, diffusion efficiency, and surface agitation.
Engineering & Performance
- Laser-Precision Metal-on-Metal Valve Seat: Engineered for consistent regulation and long-term operation
- Multi-Stage Micron Filtration: Filtration at the inlet and outlet helps protect internal pneumatic components
- 360° Adjustable Needle Valve: Allows flexible positioning during installation
- Integrated Pressure Relief Valve: Provides additional system protection
- Durable Aluminum Regulator Body: Compact construction designed for demanding aquarium environments
- Premium Pneumatic Components: Selected for precision, reliability, and long-term performance
- USA Inspection & Testing: Each regulator is pressure tested and leak checked prior to shipment
Specifications
- Installation: CGA-320 standard USA CO2 cylinders
- Pressure Reduction: Single-stage
- Pressure Monitoring: Integrated working-pressure gauge
- Output Pressure Range: 0–70 PSI
- Standard CO2 Distribution: One aquarium
- Multi-Aquarium Expansion: Optional GLA GRO CO2 Splitter available separately
What’s Included
- GLA GRO CO2 Regulator
- Integrated electric solenoid
- Integrated working-pressure gauge
- Precision needle valve
- Integrated bubble counter with check valve
- GLA OEM CO2 tank seal
Please Note: A CO2 cylinder, CO2-resistant tubing, and a compatible diffuser, atomizer, or reactor are required to complete the CO2 installation and are sold separately.
Optional Multi-Aquarium Expansion
The GLA GRO is designed primarily as a streamlined single-aquarium regulator but can be expanded using the optional GLA GRO CO2 Splitter.
Each splitter outlet includes its own precision needle valve, allowing CO2 flow to be adjusted independently for each connected aquarium.
- Expand one GRO regulator to multiple aquariums
- Independent CO2 adjustment for each outlet
- Direct compatibility with the GLA GRO regulator platform
- Compact expansion without replacing the regulator
Frequently Asked Questions
Is the GLA GRO a dual-stage regulator?
No. The GRO is a single-stage regulator designed around a compact and straightforward planted aquarium CO2 configuration. For aquarists who prefer dual-stage pressure regulation, GLA also offers the DS-Mini and PRO-DS regulator platforms.
Will the GRO work with standard refillable CO2 cylinders?
Yes. This model uses a CGA-320 connection for standard refillable CO2 cylinders used in the United States.
Can the GRO run more than one aquarium?
Yes. The optional GLA GRO CO2 Splitter can be added to provide independently adjustable CO2 outlets for multiple aquariums. For larger modular installations, a GLA DS-Mini or PRO-DS regulator may provide a more integrated expansion platform.
Can I use a diffuser, inline atomizer, or CO2 reactor?
Yes. The adjustable 0–70 PSI output allows the GRO to be configured with many planted aquarium CO2 delivery methods when operated within the pressure and flow requirements of the selected equipment.
What size aquarium can I use the GRO on?
The regulator itself is not limited to a specific aquarium volume. Appropriate CO2 delivery depends on plant demand, lighting, circulation, diffusion method, surface agitation, and overall system configuration. Larger or higher-demand systems may benefit from different diffusion equipment or one of GLA’s dual-stage regulator platforms depending on the installation.
Is the GRO suitable for someone new to pressurized CO2?
Yes. The GRO provides a straightforward pressurized CO2 platform while retaining precise adjustment, automatic solenoid control, integrated flow monitoring, and the component quality expected from GLA equipment.
Choosing the Right GLA CO2 Platform
The GLA GRO is our streamlined single-stage platform for aquarists seeking compact, precise CO2 control. The DS-Mini combines dual-stage pressure regulation with a compact modular design, while the PRO-DS is our full-size dual-stage platform with expanded pressure range, instrumentation, and modular configuration options.
Each platform is designed for a different installation style and level of system flexibility.
Compare GLA CO2 Regulators & Systems
GLA CO2 Equipment
Green Leaf Aquariums specializes in planted aquarium CO2 equipment engineered around precision, reliability, and long-term performance. GLA regulator systems are built specifically for the demands of nature aquariums and high-tech planted aquarium environments.
Each GLA regulator is individually inspected and tested in the USA prior to shipment to help ensure dependable operation and consistent performance.
Support & Warranty
Return Policy: Due to the technical nature of pressurized aquarium CO2 equipment, this item is non-returnable and non-refundable. Qualifying defects remain covered under the GLA Limited Lifetime Warranty and are handled separately through warranty support. Please contact GLA prior to ordering if you need assistance with product selection, installation, or compatibility.
- Limited Lifetime Warranty: Regulator covered against qualifying defects in materials and workmanship
- Lifetime Support: Expert assistance available
- Installation Guidance: We’re here to help you get started
Limited Lifetime Warranty: GLA CO2 regulators are covered by a limited lifetime warranty against defects in materials and workmanship for the original purchaser. This warranty is non-transferable and applies only when the product is used in accordance with Green Leaf Aquariums, LLC (GLA) guidelines and standard operating practices.
Warranty coverage applies only to products purchased directly from greenleafaquariums.com or authorized sales channels. Proof of purchase is required for warranty claims.
This warranty does not guarantee product performance for the lifetime of the purchaser. Product lifespan may vary based on usage, installation, maintenance, and operating conditions.
- Coverage applies only to manufacturing defects under normal use
- GLA reserves the right to repair, replace, or issue store credit at its sole discretion
- If a product is discontinued, a comparable replacement or credit may be provided based on product condition and age
Warranty Exclusions:
- Improper installation, misuse, neglect, or accidental damage
- Use of improper tools, fittings, or excessive force
- Modifications, alterations, or unauthorized repairs
- Damage caused by contamination, corrosion, or improper gas supply
- Normal wear, cosmetic wear, or external damage that does not affect normal functionality
Important: A wrench should only be used to secure the regulator to the CO2 cylinder. Damage resulting from improper use of tools, excessive force, or incorrect installation methods is not covered under this warranty.
GLA is not responsible for damage caused by improper installation or use. However, repair services and support may be available for a fee.
CO2 cylinders, tubing, cartridges, and other consumable or accessory items are not covered under the regulator warranty unless otherwise specified.
For complete warranty coverage, exclusions, claim requirements, and terms, please review our Shipping, Returns & Warranty Policy.
Customer Reviews
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Solid Regulator
I had originally purchased a regulator on Amazon for my setup. While that one did work, it felt flimsy and I had to tighten the solenoid every time I switched out tanks. I just wanted something I had more confidence in in the long right. Confidence in your equipment is a big deal when you have so much money invested in a tank that relies on it. So I went with this one and could not be happier. It feel more durable and was easier to get the bubble count correct compared to my previous regulator. While I have only had this one in use for a couple weeks now, I have had no issues.
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I love it
I run this regulator on a 90g tank and so far its been great. I like that it will work on every type of cylinder on the market. Should my tank plans change this regulator is super flexible. Although its not modular like the DS model it still uses the same guts. Thank you GLA.
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I love this regulator.
What a terrific regulator, exactly what my tank needed. It came with everything in the box you would need to install and get moving. Came with all the tools to install and even service it in the future. Installing it was super easy, only a fe w minutes as the instructions are super easy to follow. I also found this helpful,https://www.youtube.com/watch?v=K_Sv5Vb4yfg&t=53s You will be extremely happy with your Gro regulator, top notch.
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Super build and quality
I got this for my calcium reactor and its all I could ask for. Compact,heavy duty and uses legit water tight chord grip.
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Quality matters
No more headaches from nasty finicky needle valves. Moving to a high end needle valve is an amazing feeling. It just works.
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So far am very pleased
I received my regulator 2 weeks ago and must say I am very pleased so far. My old regulator had a crap needle valve and would dump CO2 into my tank sometimes. After installing this regulator and also getting a new co2 diffuser (I got a metal one since I broke the glass one when taking it out for a cleaning), my plants are looking quite happy and there is a steady stream of bubbles into the tank daily that I haven't really had to adjust. I will say an improvement to the design could be painting arrows on the dials to indicate which direction to turn the valves in- not gonna lie that confused me very much upon installation. Also, there was one day where I set the pressure for 40 ppm? and the next morning it was at 20 ppm. However, that could have been other factors and not the regulator's fault. Anyway, overall so far I am very glad I spent the money on this regulator! Also, GLA's customer service was helpful. __________________________ Reply: It was a pleasure helping you with your co2 system. When setting up its critical to always adjust your PSI with the solenoid activated in the off position. This will keep any upstream pressure from effecting physical adjustment of the psi gauge. Its a basic mistake we see made often. However no harm no foul because it can not damage anything. It only takes basic procedure know how and the rest is breezy. Thank you for your trust and support! Best, Laura @ GLA-Team
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Great quality,simple to set up
Cant think of anything i could possibly critique, the regular was delivered quickly, went together quickly and easily, and is keeping my co2 levels perfect for my plants
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Beautifully made, sturdy, and functions immaculately
One of the more well made pieces in my setup. Too bad it has to hide in the cabinet. This regulator feels sturdy, and the dials are well made and so smooth. Highly recommended.
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Excellent co2 regulator
I bought this regulator along side a GLA DS series co2 regulator. I use this one on a 10g tank that has a small cabinet space so I needed something compact. I was not totally sure what to expect when it arrived but I can say this co2 regulator has a really nice build quality. The needle valve was super easy to adjust, install was almost thoughtless. I had it installed in under 5 minutes. This co2 regulator was above and beyond my expectations. GLA service was second to none to boot.
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Perfect
I dont know much about aquarium co2 systems, this was my first. Its been a couple months since I had it and its been absolutely great. The only thing I do is refill the bubble counter and wipe clean regularly with plant based metal cleaner. Its just so pretty I cant help but to keep it looking so good. Its the nicest piece of aquarium equipment I own and it was only $150. Very happy with all my purchases from GLA.
