Description
GLA GRO Planted Aquarium CO2 System
The GLA GRO CO2 System provides a streamlined foundation for pressurized CO2 injection in planted aquariums. Built around the GLA GRO regulator platform, the system combines precision CO2 control, automatic operation, a refillable aluminum CO2 cylinder, and CO2-resistant tubing in one coordinated package.
Designed for clean installation and dependable long-term operation, the GRO System is an excellent choice for aquarists who want the essential pressurized CO2 components without the additional size or modular architecture of a dual-stage system. 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
- Included Cylinder: 5 lb aluminum CO2 cylinder; one- or two-cylinder package selectable at purchase
- 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
- Tubing: 10 feet of CO2-resistant aquarium tubing
- Warranty: GLA Limited Lifetime Warranty on the regulator
Best For
- Aquarists building a pressurized planted aquarium CO2 setup
- Single planted aquarium installations
- Hobbyists who want the regulator, refillable CO2 cylinder, and tubing in one package
- Installations where simplicity and clean equipment layout are priorities
- Beginner and experienced aquarists seeking a straightforward CO2 system
- Planted aquariums using diffusers, inline atomizers, or CO2 reactors
The GRO System is not limited to a particular aquarium size. Appropriate CO2 delivery depends on plant demand, lighting, circulation, diffusion method, surface agitation, and overall system configuration.
For aquarists who prefer dual-stage pressure regulation or a modular manifold platform, GLA also offers complete CO2 systems built around the DS-Mini and PRO-DS regulator families.
Why Choose the GLA GRO CO2 System?
The GRO CO2 System combines the core components needed to establish a refillable pressurized CO2 setup while keeping the installation compact and straightforward.
- Coordinated CO2 Package: Regulator, refillable aluminum cylinder, CO2-resistant tubing, and tank seal included
- Compact Single-Stage Platform: 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
- Refillable Cylinder: Includes a 5 lb aluminum CGA-320 CO2 cylinder that can be filled locally
Precision Control & Automation
The GLA GRO combines a precision needle valve, electric solenoid, integrated working-pressure gauge, and bubble counter into a compact regulator assembly designed specifically for planted aquarium CO2 use.
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 working-pressure gauge provides a clear visual reference for regulator output pressure, and the 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 measurement of dissolved CO2. Actual CO2 requirements vary with aquarium volume, plant mass, lighting, circulation, diffusion efficiency, and surface agitation.
Refillable 5 lb Aluminum CO2 Cylinder
The GRO CO2 System includes a refillable 5 lb aluminum CO2 cylinder with a standard CGA-320 connection. The cylinder ships empty and must be filled by a local CO2 or compressed-gas supplier before use.
One- and two-cylinder package options are available. Select the cylinder quantity that best fits your installation and CO2 supply needs when ordering.
Important: CO2 cylinders ship empty.
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 Working-Pressure Gauge: Provides a visual reference for regulator output pressure
- 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
- Included Cylinder: 5 lb refillable aluminum CO2 cylinder
- Cylinder Quantity: One or two cylinders selectable at purchase
- Included Tubing: 10 feet of CO2-resistant aquarium tubing
What’s Included
- GLA GRO CO2 Regulator
- Integrated electric solenoid
- Integrated working-pressure gauge
- Precision needle valve
- Integrated bubble counter with check valve
- Selected quantity of 5 lb aluminum CO2 cylinders (ships empty)
- 10 feet of CO2-resistant aquarium tubing
- GLA OEM CO2 tank seal
Please Note: A compatible diffuser, inline atomizer, or CO2 reactor is required to deliver CO2 into the aquarium and is sold separately. The included CO2 cylinder ships empty and must be filled locally before use. For added protection against backflow, we recommend using a compatible inline check valve in your CO2 installation.
Frequently Asked Questions
Does the GRO CO2 System include everything I need?
The system includes the regulator, refillable CO2 cylinder, CO2-resistant tubing, and tank seal. You will also need a compatible diffuser, inline atomizer, or CO2 reactor to introduce CO2 into the aquarium. The included cylinder must be filled locally before use. For added protection against backflow, we recommend using a compatible inline check valve in your CO2 installation.
Does the CO2 cylinder arrive filled?
No. CO2 cylinders ship empty and must be filled by a local CO2 or compressed-gas supplier before use.
Why are one- and two-cylinder options available?
The system can be ordered with either one or two 5 lb aluminum CO2 cylinders. Select the cylinder package that best fits your CO2 supply and installation needs.
Can the GRO CO2 System run more than one aquarium?
Yes. The standard system is configured for one aquarium, but the optional GLA GRO CO2 Splitter can be added to provide independently adjustable CO2 outlets for multiple aquariums. Operating additional aquariums will increase total CO2 consumption.
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 System 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.
Is the GRO CO2 System suitable for beginners?
Yes. The GRO System provides a straightforward way to establish a refillable pressurized CO2 setup while retaining precise adjustment, automatic solenoid control, integrated pressure monitoring, and the component quality expected from GLA equipment.
Optional Multi-Aquarium Expansion
The GLA GRO CO2 System is designed primarily as a streamlined single-aquarium system 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
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, dual-gauge instrumentation, and modular configuration options.
The GRO CO2 System packages the GRO regulator with a refillable aluminum CO2 cylinder and CO2-resistant tubing, providing a convenient foundation for a complete planted aquarium CO2 installation.
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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We are loving GLA products and support!
Its been such a wonderful journey with GLA since they have been helping with our 150g new aquascape. Its sorta a big deal in my neighborhood since everybody comes to my house every weekend for the BBQ. Our tank id densely planted with quite an expense in plants that we have curated over the months. Now that we have this system in place the plants have really taken off. Super easy to set up and is just excellent quality. We are also using the GLA Nectar AIO fertilizer in medium dosage setting and things are just fantastic. Ive gotten a few neighbors on board to set up tanks and to me this is such a blessing this day and age. Who would have thought my planted tank would bring a community together. Thank you GLA and staff!
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Worth every penny spent!
Highly recommend this co2 system from GLA. Extremely high quality for what you are paying. Do know you need a couple parts to add, like a co2 diffuser and drop checker. David at GLA helped me choose both and only took minutes to get me squared away. I buy a lot of stuff on Amazon for my tanks and over the years I noticed how cheap they were. I decided to dicth amazon and go direct to dealers the the quality from GLA was leaps and bounds the Amazon junk. Cant beat the service with very helpful knowledgable staff. I asked so many questions I felt so bad! But, when people love what they do the service is amazing. My tank is being fed co2 as I write this review and the diffusion is fun to watch. GLA if you see this review you should figure a way for your customers to add photos, would love to share some!
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A system worth every penny.
This is a terrific system. You get good value and price with a team of customer service Ive yet to experience with anything involving customer service these days. It took only 10 minutes to fully set up and it was effortless. The system has been turning on and off daily as it should and absolutely no interventions. Always steady and no messing around. If I need to feed another tank I plan to get the splitter system they offer. Well made equipment and well priced from a US based company.
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Excellent service and even better quality.
My first co2 system for our planted tank. After weeks of reading online and in Facebook groups we knew GLA was the o e to go to. We were confused as what system to buy with all the options. After consulting with tech support they took the time to explain everything and even offer phone text support. These days almost everything we buy is online. Working with GLA was online, but they made it so comfortable to buy that we felt like we were in a store. It felt like somebody was holding our hand the whole way. An experience like no other online purchase we’ve ever made. Certainly not Amazon. The staff is amazing and kudos to whoever trains them. The quality of the product alone was above and beyond our expectations at such a low price when considering all you get. Neatly packed and arrived with speed our aquascape is brimming with growth. I’m hoping to start selling my clipping one day on my Etsy! Thank you GLA, you have a loyal customer for life. Sincerely, Kenisha and family.
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Top tier co2 kit!
Loving our new co2 system from GLA. Arrived as fast as Amazon and with supirior customer support. The regulator is extremely well made, its not chincy at all. Ive seen and held Fzone regulators and Co2Art regulators many times and I was envious then. But! Once a GLA unit is in your hands there is just no comparison. This is real high pressure co2 equipment. Rest assured GLA is real co2 hardware vs the others.
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Brilliant co2 system and very nice!
Was a pleasure working with GLA trying to figure out my co2 system needs. This Gro system has been working wonderfully and my tank has never looked better. Very well priced and quality to boot, cant ask much more than that coming from GLA! The very best!
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Worth every penny invested.
I normally dont leave reviews out of pure laziness but I feel this is necessary. These days everything I buy is online and this co2 system was no exception to the rule. My LFS actually advised I go with GLA vs what they were selling which was Ultum Nature systems. I was able to touch and feel the Ultum system so I have a good idea to compare. Instantly the GLA was double the weight, about the same size but much heavier. The little needle valve also felt so much better when you adjsut the bubble rate. At the LFS the Ultum kit felt scratchy and oddly responsive. I could tell the GLA kit was a finer piece of equipment, 9 months in and its been doing fantastic. It only took me minutes to install and I have not touched it since. Actually I do wipe it down to keep dust off it. I have an ADA cabinet so its completely visible in my living room. GLA makes one exceptional co2 system at a great price. The customer service was astounding, very kind and helpful people that made me feel like family. Very rare these days. GLA are highly admirable people son dont hesitate to buy from them. I love this Gro co2 system!
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Marvelouse system and customer support.
Pleased is an understatement, GLA is a pleasure to do business with. Kind and helpful and provide top quality co2 system with this Gro co2 system. Arrived speedily and very well cared for in transit with UPS. I knew right away it was great quality and has been now for a few months. You can rest assured GLA is top tier.
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Very nice!
Very pleased with this kit. Great price and the customer service is something they should write a book on, just amazing. GLA is the way to go!
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Will be buying another system soon!
Love this co2 system and definitely plan to buy another kit today. Can’t express my gratitude enough to GLA for the service. They helped me pick this kit and it’s been flawless everyday.