Carbon dioxide (CO2) is one of the key elements required for plants, both aquatic and terrestrial, to survive and thrive. In natural waters, dead leaves, animals, and other organic materials rot and decompose to produce CO2 gas. However, there aren’t as many CO2-producing elements in aquariums.
For that, we need to artificially infuse CO2 in heavily planted tanks. And to successfully accomplish that, you need a CO2 regulator that helps you control the inflow of carbon dioxide in the tank.
We’ve reviewed the best CO2 regulators in this article that are regularly used by us and most professional aquarists.
Table of Contents
8 Best CO2 Regulator for your Aquarium
1. VIVOSUN Hydroponics CO2 Regulator
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 4000 PSI |
| Integrated Solenoid | Yes |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | 1.58” high-pressure gaugeFlow Meter |
| Ease of Installation | Absent instruction manual Easy to install with minimal tools. |
A prominent name in the aquarium trade, VIVOSUN CO2 Regulator features an accurate high-pressure gauge and integrated solenoid with durable, long-lasting brass components. It can handle up to 4000 PSI pressure and fits perfectly over CGA320 universal CO2 tanks. However, it lacks a safety valve to reduce pressure if necessary.
Key Features
- Integrated Solenoid for Timer Control
The integrated solenoid connects directly with your lighting timer circuits to provide CO2 only when the aquarium light is on.
- Heavy-Duty Brass Construction
This CO2 regulator unit should last you multiple tanks and years. The brass construction doesn’t let it rust and cause a leak in active situations.
- Adjustable to up to 4000 PSI
The unit allows you to adjust up to 4000 PSI tank pressure. For aquariums, however, 600 – 1000 PSI pressure should be sufficient for your planted tank.
- 0.5 – 15 SCFH Flow Meter
Measurable up to 15 SCFH, the flow meter is pretty accurate and readable.
Pros
- Durable Material, doesn’t rust.
- CGA-320 compatible. Works with typical CO2 tanks.
- 5-meter plastic dispensing tube
Cons
- Leaking issues have been prevalent. Use sealants while installing the unit.
- The absence of a working pressure gauge. It makes it more challenging to adjust output pressure.
2. MRbrew Keg CO2 Regulator
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 3000 PSI |
| Integrated Solenoid | No |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | 2 X Pressure Gauges to measure working pressure and tank pressure |
| Ease of Installation | The user manual and most accessories required are included. Easy to install. |
Integrated with two pressure gauges, one to measure tank pressure and the other for working pressure (output), the MRbrew Keg CO2 regulator is a multi-purpose product capable of satisfying any planted setup. Its leak-proof connector supports the CGA320 connections and the on-off knob works as a fail-proof valve to stop CO2 from leaking into the tank.
Key Features
- 5/16” Barbed Fitting
You can securely fit a 5/16” output hose to the barbed fitting or reduce it down to your preferred size with adapters.
- Measurable up to 3000 PSI
The tank pressure is measurable up to 3000 PSI, but shouldn’t go beyond the 1000 range for planted aquariums. Regardless, the output pressure gauge is a better indicator of CO2 infusion.
- Pressure Release Valve
A pullable pressure-release valve ensures your safety against higher pressures. It prevents leakage and other major incidents by releasing the valve at 45 PSI.
- 0 – 60 PSI Working Pressure / Output Pressure Gauge
The unit comes with a premium Output pressure gauge to accurately measure the CO2 infusion rate in the aquarium. For planted tanks, it shouldn’t transcend the 30-40 range.
Pros
- Having both pressure gauges helps you to fine-tune the regulator and estimate CO2 levels in the tank.
- Doesn’t rust or leak frequently.
- Can be used for multiple purposes.
Cons
- Shut-off valve functionality issues are present.
Also Read: 4 Signs Of Too Much CO2 In Aquarium
3. MANATEE CO2 Regulator Emitter System
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 4000 PSI |
| Integrated Solenoid | Yes |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | High-pressure gaugeFlow Meter |
| Ease of Installation | Most accessories, including washers, are included in the package. The instruction manual is also pretty straightforward. Easy to install. |
Designed for aquariums and indoor gardens, the MANATEE CO2 Emitter System is one of the most cost-effective and well-built CO2 regulators. Equipped with just a flow meter, gauge, and an industrial solenoid, the Manatee system is also among the simplest CO2 regulators in this segment. Similar to most regulators, it also supports CGA320 connectors.
Key Features
- Industrial Solenoid Valve
The industrial-grade solenoid valve used in the unit can be connected to timer circuits or additional lighting setup of your aquarium. It helps regulate the CO2 infusion.
- Supports up to 4000 PSI Pressure
This practical CO2 regulator can manage up to 4000 PSI tank pressure. You can use it with much larger tanks and more density of aquatic plants.
- 0.5 – 15 SCFH Precision Flow Gauge
The flow gauge is quite accurate and helps you regulate the output CO2 flow.
- Solid Brass Build
Rust-free solid brass build of MANATEE CO2 Emitter ensures a longer lifespan and reduced need for parts replacement.
Pros
- Installation is pretty easy and doesn’t require any complex fixtures.
- Pricing is pretty reasonable compared to other CO2 regulators.
- Solid, durable metal body.
Cons
- The needle valve needs occasional adjustment.
- Leakage issues may occur. Always sound check after installation.
4. TerraBloom CO2 Keg Pressure Regulator
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 3000 PSI |
| Integrated Solenoid | No |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | 2 X Pressure Gauges to measure working pressure and tank pressure |
| Ease of Installation | Most accessories, including O-rings and washers, are included. Hand tools are required to install. Easy to install. |
Complete with only the necessary features and a robust build, the TerraBloom CO2 Regulator supports CGA320 connections and comes with 0 – 3000 PSI tank pressure support. The adjustment knob in this unit is pretty smooth and durable. It also delivers pretty good resistance to minimize recalibration.
Key Features
- Pressure Release Valve
A manual pull-style pressure release valve helps you release CO2 pressure when the output pressure seems too high to use safely.
- 0 – 50 PSI Output Pressure Support
You can adjust the working pressure (output pressure) in the region of 0-50 PSI. For most aquariums, 30 PSI should be more than enough.
- Dual Pressure Gauge With Safety Markings
Working pressure and tank pressure are separately monitored with green and red markings to indicate the safe usage limits.
- Leak-Resistant Shut-off Valve
A shut-off valve has been provided to doubly ensure CO2 doesn’t leak into the aquarium when it’s not necessary or malfunctioning.
Pros
- Installation is pretty straightforward.
- Durable and heavy. Seems to be made pretty well.
- The knob is pretty resistive, and we see it as a plus.
Cons
- The flow meter gauge is absent.
Also Read: What Is A CO2 Diffuser? Types Of Diffusers & How To Use Them
5. Clscea Aquarium CO2 Regulator
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 2000 PSI |
| Integrated Solenoid | Yes |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | 2 X Pressure Gauges to measure working pressure and tank pressure |
| Ease of Installation | Most accessories, including premium O-rings and washers, are included. The instruction manual is present. Wrenches aren’t required. |
One of the most sleek and modern designs, the Clscea Aquarium CO2 Regulator supports up to 2000 PSI pressure and has two different pressure gauge position options to choose from. Depending on your preference, a sagittal or axial option can be chosen. The unit also has a pretty standard build quality with zero complexity installation process.
Key Features
- Modular Design
Most parts of the product can be replaced without needing to repurchase the whole unit. Replacement solenoid parts, bubble counter, and tubing are easily available online to buy.
- Micro Solenoid Valves
The Cool Touch micro solenoid valve of the Clscea CO2 regulator is more power efficient and doesn’t feel as warm as other solenoid devices.
- Wrench-Free Operation
Handwheel technology ensures a wrench-free installation for aquarists with minimal access to tools. However, you may need a few basic tools to work with the unit.
- Dual Pressure Gauge for Tank and Working Pressure
Both tank pressure and working pressure (output) can be measured and adjusted with the help of the adjustment knob.
Pros
- Screwdriver included in the package.
- Supports standard CGA320 tanks.
- Premium O-rings are provided in the package.
Cons
- Tubing isn’t included.
- A flow meter is absent, only a basic bubble counter is provided.
6. Taprite CO2 Dual Gauge Regulator
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 2000 PSI |
| Integrated Solenoid | No |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | 2 X Pressure Gauges to measure working pressure and tank pressure |
| Ease of Installation | Hand tools are required to install. The user manual wasn’t present. |
Built to last and address common CO2 regulator issues, the Taprite CO2 Dual Gauge Regulator is the most minimal product on our list. While it may not look like it, it can handle pressures up to 2000 PSI for tank pressure and 50 PSI for working pressure. It also employs polycarbonate bonnets to make easier adjustments.
Key Features
- Connects Directly to Source
Compared to other CO2 regulators, this unit directly connects to the tank and removes a component that can leak or malfunction.
- Pull Cap Adjustment Lock
The adjustment bonnet can be pulled to be unlocked and rotated. Push it back in to lock the adjustments safely until further recalibration is required.
- 10-Micron Built-in Filter
A 10-micron filter has been employed in the brass conjuncture to avoid contamination. Dust, dirt, and rust are the most common contaminants of CO2 regulators.
- Pressure Safety System
A safety feature (not a valve) exists in the system to release the excess pressure above 55-60 PSI.
Pros
- Full brass installation. Heavy-duty and very durable.
- Sustains pressure even when the tank pressure is low.
- Better ball-type check valve is used as the shut-off valve to replace the needle valves.
Cons
- Pricing is on the higher side.
- Integrated solenoid is absent.
Also Read: The 3 Pillars Of Successful Planted Tanks
7. Titan Controls CO2 Regulator
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 4000 PSI |
| Integrated Solenoid | Yes |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | High-pressure gaugePrecision accuracy flow Meter |
| Ease of Installation | Most accessories, including O-rings and washers, are included. Easy installation manual. |
One of the most reliable brands with years of experience in manufacturing controllers, the Titan Controls CO2 Regulator thrives on longevity and accuracy. This multi-purpose CO2 regulator has all the necessary features you may need as an aquarist, but abstains from any additional complex features. However, an output pressure gauge would’ve been better.
Key Features
- Heavy-Duty Solenoid Valve
Controllable with Titan Controls CO2 Controller and other controllers, the smart solenoid valve allows timer control, CO2 trend chart recording, and PPM deadband customizing.
- Supports up to 4000 PSI
This model of CO2 controller from Titan Controls can support up to 4000 PSI tank pressure. However, it’s best to keep the CO2 output to a 700-800 PSI range.
- Precision Flow meter
The flow meter gauges 0.5 to 10 SCFH flow rate with precision. Adjust it according to the density of your plants in the tank.
- Supports CGA320 Connectors
Typical CO2 tanks with CGA320 connectors are compatible with the Titan Controls CO2 Regulator.
Pros
- Brass construction for durability and longer lifespan.
- Includes CO2 dispensing tubing.
- High-quality oilless pressure gauge.
Cons
- Price is on the higher side.
- Absent second pressure gauge.
8. INKBIRDPLUS Aquarium CO2 Regulator
| Specification Name | Particulars |
| Pressure Control (PSI) | 0 – 3500 PSI |
| Integrated Solenoid | Yes |
| Compatibility | Fits standard CO2 tanks [CGA-320] |
| Gauges | 2 X Pressure Gauges to measure working pressure and tank pressure.Bubble Counter |
| Ease of Installation | Most accessories, including O-rings and washers, are included. A handy spanner has also been included. Easy to install. |
Specially designed for aquariums, the INKBIRDPLUS Aquarium CO2 Regulator can handle tank pressure for up to 3500 PSI and output pressure for up to 150 PSI, which is pretty high compared to other CO2 regulators. It also suits the standard CGA320 connectors pretty smoothly. Moreover, its aluminum alloy construction makes it lighter and more durable.
Key Features
- Solenoid Valve Included
A high-performance solenoid valve, controllable with timer circuits and lighting setups, is integrated into the CO2 regulator.
- Non-Return Bubble Counter
The bubble counter is fitted with a check-valve function to prevent water backflow. The bubble counter, however, can’t be used to gauge the flow rate.
- Dual Pressure Gauge
Both tank pressure and output pressure gauges are present in this unit. Consider keeping the output pressure gauge to a maximum of 30 for optimum CO2 injection.
- High-Precision Trimmer Valve
A heavy-duty trimmer valve, specially made for aquariums, has been employed to control the output CO2 flow.
Pros
- All installation tools are included.
- Aluminum alloy keeps the unit light.
- No leaking issues have been found.
Cons
- A proper flow meter would’ve been better.
Buying Guide
Most aquarium CO2 regulators are fundamentally pretty similar. They control the flow of carbon dioxide from the source (tank) to the aquarium. In the process, some products employ two pressure gauges, some manufacturers include integrated solenoids, and some units come with a flow meter. It’s your preference that determines the right product for you.
In this section, we’ll talk about the parameters we’ve considered to review the above-mentioned products and guide you to choose optimally.
Pressure Control
For aquariums, you don’t need control over anything beyond 1000 PSI tank pressure or 30 PSI working pressure. Yet, you should always consider having at least 2000 PSI tank pressure adjustment in your CO2 regulator for more accuracy and precision.
This is because the most common oil-less gauges are only accurate at a lower reading state.
Integrated Solenoid
Integrated solenoid helps maintain the cycle of CO2 flow and restricts its usage at night. Having the liberty to control the runtime of the CO2 regulator may seem enticing, but it’s redundant in most cases. If you have multiple planted aquariums, it’s a must-have feature, otherwise, you can manually control the timing.
Compatibility
Most CO2 regulators support the North American standard CGA320 connectors. Nevertheless, it’s advised to verify it before buying, as a few manufacturers use their own tanking systems for their products.
Also Read: 12 Aquarium Plants That Don’t Need CO2
FAQs
We recommend the Taprite CO2 Dual Gauge Regulator for its durability, functionality, and ease of installation. It’s one of the few CO2 regulators that connects directly to the tank and has a built-in filter to prevent contamination.
Infusion of carbon dioxide is the best way to regulate CO2 levels in your aquarium. If you have a planted aquarium, infusing further CO2 can promote their growth.
A 700-800 PSI tank pressure, paired with a max 30-35 PSi output pressure, should be enough for heavily planted tanks.
The Bottom Line
Hopefully, you’ll now be able to choose the best aquarium CO2 regulator for your planted tank. Follow both our reviews and buying guide to get informed and make the right choice.