Description
GLA GRO Planted Aquarium CO2 Regulator
Precise CO2 control in a compact, easy-to-use design.
The GLA GRO Aquarium CO2 Regulator combines piston-type pressure regulation, precise CO2 adjustment, and automatic operation in a compact design. Its integrated components make it easy to control and monitor CO2 delivery without requiring a large regulator assembly.
GRO can supply a single planted aquarium or multiple aquariums with the optional GRO CO2 Splitter. Each regulator is individually inspected, pressure tested, and leak checked in the USA before shipment.
At a Glance
- Pressure Regulation: Precision piston-type mechanism
- Cylinder Connection: CGA-320 standard USA CO2 cylinders
- CO2 Adjustment: Precision needle valve
- Automation: Integrated electric solenoid
- Monitoring: Working-pressure gauge and bubble counter
- Expansion: Optional GRO CO2 splitter for multiple aquariums
Best For
- Single planted aquariums of various sizes
- Compact installations where equipment space is limited
- Aquarists who want precise CO2 adjustment and automatic timer control
- Existing CO2 setups using compatible CGA-320 cylinders
- Multiple aquariums with optional GRO splitter expansion
Why Choose the GLA GRO?
GRO combines the essential components for precise, automated CO2 delivery in one compact regulator. Here's what its features do for your aquarium setup.
- Piston-Type Pressure Regulation: Reduces cylinder pressure to a stable, adjustable working pressure for consistent CO2 delivery.
- Precise CO2 Adjustment: The needle valve allows fine control of CO2 flow and can be rotated 360° for convenient positioning.
- Automatic CO2 Control: The integrated solenoid lets you turn CO2 injection on and off automatically using a timer or compatible controller.
- Easy Monitoring: The working-pressure gauge displays regulator output pressure, while the bubble counter provides a visual reference for adjusting CO2 flow.
- Integrated Protection: A pressure relief valve provides additional protection, while the bubble counter check valve helps prevent aquarium water backflow. Micron filtration helps protect internal regulator components.
- Durable Construction: An aluminum regulator body, precision metal-on-metal valve seat, and quality pneumatic components are designed for long-term use.
- USA Inspection & Testing: Every GRO regulator is individually inspected, pressure tested, and leak checked in the USA before shipment.
What's Included
- GLA GRO CO2 Regulator
- Integrated electric solenoid
- Integrated working-pressure gauge
- Precision adjustable needle valve
- Integrated bubble counter with check valve
- GLA OEM CO2 tank seal
What You'll Need Separately: A compatible refillable CO2 cylinder, CO2-resistant tubing, and a diffuser, inline atomizer, or reactor are required to complete your CO2 installation. These items are sold separately.
Need a cylinder too? Explore our GLA GRO Complete CO2 System, which includes the GRO regulator, a refillable aluminum CO2 cylinder, and selected installation components.
Optional Multi-Aquarium Expansion
The optional GLA GRO CO2 Splitter allows one GRO regulator and CO2 cylinder to supply multiple planted aquariums.
Each splitter outlet has its own precision needle valve, so you can adjust the CO2 flow independently for each aquarium without replacing your existing regulator.
Technical Specifications
- Model: GLA GRO Aquarium CO2 Regulator
- Pressure Regulation: Piston-type mechanism
- Cylinder Connection: CGA-320, standard USA CO2 cylinders
- Adjustable Working Pressure: 0–70 PSI
- Pressure Monitoring: Integrated working-pressure gauge
- Needle Valve: Precision, 360° adjustable
- Automation: Integrated electric solenoid
- Bubble Counter: Integrated, with check valve
- Pressure Relief: Integrated pressure relief valve
- Regulator Body: Aluminum construction
- Valve Seat: Laser-precision metal-on-metal
- Filtration: Multi-stage micron filtration at inlet and outlet
- Multi-Aquarium Expansion: Optional GLA GRO CO2 Splitter
- Quality Control: Individually inspected, pressure tested, and leak checked in the USA
The GLA Difference
20 Years of CO2 Expertise. A Commitment That Goes Beyond the Equipment.
For 20 years, Green Leaf Aquariums has specialized in CO2 equipment for planted aquariums. Throughout that time, we've remained committed to advancing the quality, precision, and reliability of aquarium CO2 regulation. Our experience, long-standing manufacturing partnerships, and close relationships with our customers have helped shape the equipment we offer today.
We don't believe in standing still. We work closely with our manufacturing partners to continually refine our products, incorporate real-world customer feedback, and introduce meaningful improvements. From precise piston-type regulation to advanced dual-stage designs and modular expansion, GLA has consistently worked to raise the standard for aquarium CO2 equipment through thoughtful engineering and innovation.
Every GLA CO2 regulator is individually inspected, pressure tested, and leak checked in the USA before shipment. We take quality control seriously because we understand the importance of dependable CO2 delivery and the trust our customers place in our equipment.
But what truly sets GLA apart is the company behind the products. We're a small business with a personal commitment to the people we serve. We take pride in helping customers select the right equipment, answering technical questions, providing installation assistance, and offering knowledgeable support long after the purchase. We're invested in our customers' success, and we genuinely care about their experience.
That commitment is backed by our Limited Lifetime Warranty on GLA CO2 regulators and systems for the original purchaser, covering qualifying defects under our warranty terms.
When you choose GLA, you're investing in more than precision-engineered CO2 equipment. You're choosing two decades of specialized experience, continuous product development, careful quality control, and a business that stands behind what it sells.
Twenty years of experience. A continuing commitment to innovation. A company that stands behind you.
Frequently Asked Questions
What does piston-type pressure regulation mean?
Piston-type refers to the internal mechanism that regulates CO2 pressure. GRO reduces cylinder pressure to a controlled, adjustable working pressure for aquarium use.
What size aquarium can I use GRO with?
GRO is suitable for a wide range of planted aquarium sizes. CO2 requirements depend on lighting, plant demand, circulation, and diffusion equipment rather than aquarium volume alone.
Can GRO supply multiple aquariums?
Yes. The optional GRO CO2 Splitter allows one regulator to supply multiple aquariums, with independent CO2 flow adjustment for each outlet.
Can I use GRO with an inline atomizer or CO2 reactor?
Yes. GRO supports common planted aquarium CO2 diffusion methods, including in-tank ceramic diffusers, external inline atomizers, and compatible reactor systems.
Does GRO include a CO2 cylinder?
No. This listing includes the GRO regulator and its integrated components, plus the GLA OEM CO2 tank seal. The cylinder, CO2-resistant tubing, and diffusion equipment are sold separately.
Which CO2 cylinders are compatible?
This GRO model uses the CGA-320 connection for compatible refillable CO2 cylinders commonly used in the USA.
Pre-Sales & Installation Support
GLA provides expert pre-sales assistance, equipment compatibility guidance, and installation support by email and text. Whether you're selecting accessories or setting up your CO2 regulator, we're here to help.
Support & Warranty
GLA Warranty: GLA CO2 regulators include a Limited Lifetime Warranty on qualifying mechanical manufacturing defects and a 2-Year Limited Warranty on qualifying electrical manufacturing defects. Coverage applies to the original purchaser and is non-transferable. For complete systems, regulator warranty coverage does not automatically extend to cylinders, tubing, or other accessories.
Service & Returns: GLA prioritizes repair whenever practical. CO2 regulators and systems are not eligible for voluntary returns. Warranty claims require GLA evaluation and authorization before equipment is returned for service.
For complete coverage, exclusions, service procedures, and domestic and international warranty terms, review our Shipping, Returns & Warranty Policy.
Customer Reviews
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Love it!
Super happy with GLA service and products. This kit has been solid as one can ask. Can’t wait to get my hands on their Pro DS. That’s coming up next!
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Really nice quality for the price!
The quality of the regulator is super nice and has a really nice look to it!
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GLA Quality!
This regulator will not disappoint. I have a couple other GLA regulators and tried this one for a new system. Very well built.
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I Recommend GLA!
Very happy, speedy and high quality equipment. Videos were a nice touch even though you don’t need them they were nice to have. Even cooler was the text message service they have, wow!
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Love it ?
Speedy delivery and fits right under my 29g. I already gave a used 5lb cylinder and was up and going in a few minutes, like how effortless everything is going, super smooth sailing here!
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Superb co2 regulator.
Breezy installation, loved the video links they provide. The bubble flow rate adjustment is like no other valve I’ve ever used before. Super smooth and very precise flow vs the crazy crap I deal with from the cheap stuff. I’m stoked!
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C02 reg
Great regulator,but I wish it had a dial to tell you when the tank is low.
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Very nice, high quality piece.
Was quite surprised considering the price. Comes with a very heavy duty regulator body. The bottle connection is nickel plated with a brass sintered filter, thats lab grade stuff. Installation was easy, thanks for the video GLA!
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Lovely co2 regulator.
Wonderful replacement from my Amazon garbage, it took a crap only 3 months in. Upon advisement of my local club I chose GLA as my new source. We couldn’t be happier, huge difference in what Amazon is putting out. The service was amazing no less.
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We like it:)
Exactly as described and super easy to install. Very happy:)
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Love it.
Love this GLA regulator, very compact and high quality. I would definitely buy this again or the DS series.
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Love the GLA Gro!
We love it! Super easy install in minutes and a needle valve like nothing I have ever used before. GLA valve is amazing, so easy and smooth all the way.
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Extremely happy
GLA quality on a budget. I could have chose a dual stage regulator within my budget with more options from other manufacturers/competitors but since this is my first regulator for a single 20 gallon tank I decided this was the best bet for me. No matter how much research you do ; or how many YouTube videos you may watch you can still run into trouble setting up your first c02 system and YOU ARE going to have questions. GLA is there to help and quickly answer your questions and get your c02 up and running. What you get is an extremely high quality regulator; bubble counter , tools, instructions and excellent customer service. Everything from the packaging to the regulator itself screams high quality. (Even the tape they use on the shipping box is delightful to look at ) . I’ve had mine up and running for almost a month and my plants look ultra healthy and are growing so fast , I think I’ve got my money back from trimming and replanting as opposed to buying more plants !
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Very nice and very nice needle valve.
Much improvement form my old regulator. More precise and to me easier to adjust bubble rates far more accurately. Quality is very nice and feels very heavy duty. I will be buying another one for my 80g next week!
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Best Regulator ever
From the moment you open the box you realize the quality of the product and the dedication to the customer. very well built good and solid materials super easy to assemble and works perfectly. I have only been educating myself and growing in this fantastic hobby for a year, and I was always interested in climbing one more step or jumping whatever you want to call it and I am not sorry I did it with this CO2 regulator, 100% recommended I spent hours reviewing thousands of pages and options and this is the best price-value relationship, the product you receive is incredible
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Awesome co2 regulator!
Loving the needle valve on this regulator. I have an old GLA regulator from 15 years ago with an Ideal metring valve. That needle valve was $80 alone! Well, this entire regulator is only $100 and the needle valve performs with the same precision. Amazing regulator!
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Love it!
Its been terrific, no complaints here except I need another one for my new tank or I might just bite the bullet and go with the DS-2!
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Very nice upgrade to GLA!
Loving this regulator. Its been steady since day one, love it!
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Cool co2 regulator
Does everything I ask of it. Its even taken some abuse due to my clumsy negligence. This thing is a compact powerhouse. I abuse it and it feeds my plants with gentle kisses of co2 effortlessly. GLA is the real deal, dont settle for less.
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Super nice co2 regulator
Couldn't believe it when I opened the box. Super heavy and very heavy duty feeling. All very compact and works very well, no issues 7 months so far.
