5 Best Carbon Dioxide (CO2) Regulators

Humans and animals on the planet require essential oxygen in their atmosphere to breathe and live. It’s essential, and we would die without out. This is how essential carbon dioxide is to plants, and even more so when it comes to the plants in your aquarium habitat.

Without carbon dioxide, your plants will die. Too much carbon dioxide and this can affect your fish and other aquatic species; which means you need to make sure you’re getting the balance just right.

Fortunately, this is easier than you may think thanks to the introduction of a carbon dioxide regulator.
If this is something you need in your aquarium, then you’ve come to the right place.

Today, we’re going to be exploring the top five best carbon dioxide regulators that are specifically designed with aquarium tanks in mind. This is to ensure you’re able to find the best one for you.

Wyin CO2 Regulator Aquarium Big Dual Gauge Display with Bubble Counter

Wyin CO2 Regulator Aquarium Big Dual Gauge Display with Bubble Counter

To start off our list, we’ve chosen this highly affordable CO2 regulator which has been made to suit all budgets and comes with enough features to satisfy fish tank keepers of any experience level. This 110-volt regulator is also designed to suit any standard US CO2 bottle.

With each purchase, you’ll find all the tools you’ll need to set up the tank and the regulator in your aquarium. You can accurately set when you want CO2 to be released into your tank and at what times; ultimately optimizing the plant growth cycle.

This is all complimented by the two large pressure displays which allow you to see what pressures you’re operating on accurately, and exactly how much CO2 you’re inserting into the tank and what the current levels are.

You can even set up the regulator to operate on a timer and fully automate the process, making it even easy to grow your plants. Using this kind of set up, you’ll even be able to inhibit the growth of unwanted algae and phytoplankton, ensuring the plants you want to keep in your tank have everything they need!

With a reliable solenoid, an accurate bubble counter and everything you need in a single set, this is a complete package that provides the full experience.

  • Comes with all the tools and connections you need to get set up and working
  • Two large dials for accurately reading measurements
  • Can be set up on a timer or for automatic processing
  • Highly accurate readings and CO2 flow
  • None!

Buy at Amazon

S.T. International Aquarium 2-Gauge Professional CO2 Regulator (Silver)

S.T. International Aquarium 2-Gauge Professional CO2 Regulator (Silver)

Another powerful yet easy to use aquarium CO2 regulator comes from S.T. International. This particular is designed to be as accurate as possible and provides you with precision CO2 output into your tank for optimal plant growth!

What we love the most about this CO2 regulator is the fact that it doesn’t just have to be used with full CO2 bottles, but is fully compatible with disposable cartridges. This means you can simply purchase these affordable replacement cartridges which are perfect if you don’t want to keep an entire bottle in your home.

You’ll also benefit from the highly functional solenoid magnetic valve that’s both incredibly accurate, and efficient when it comes to energy usage. This means the device doesn’t create any excess heat and is designed to last for many years to come.

We love the large dual-band dials, so you can see exactly what pressures and dosages you’re operating at which is perfect for making sure you’re adding just the right amount of CO2 into your tank.

With an included two-year warranty, a solid and durable build and the ability to process the exact amount of bubbles you want into your tank, it’s easy to see why this is one of the most popular CO2 regulators to date!

  • Comes with a two-year warranty
  • Can be used with tanks and disposable cartridges
  • Energy efficient and quiet operation
  • The functional magnetic solenoid valve
  • Different colors on gauges may be difficult for some people to read
  • No indicator light on the solenoid to say when it’s on or off

Buy at Amazon

Red Sea Fish Pharm ARER51070 Aquarium CO2 Regulator Pro System

Red Sea Fish Pharm ARER51070 Aquarium CO2 Regulator Pro System

Red Sea is a renowned and reputable aquarium accessory and equipment manufacturer, so this should give you a clear idea on what to expect in terms of quality and performance when it comes to their version of a CO2 regulator.

Since this is the Pro system, you’ll be able to regulate any kind of aquarium tank within the capacity range of 10-125 gallons, ensuring pretty much any tank you own now and in the future is covered. Of course, each aspect of the regulator is designed to stand the test of time.

Included with your regulated, you’ll find a reactor 500 piece, the CO2 regulator itself, a high precision in-line needle with dual-band detailed gauges, and a real-time CO2 monitor with 3-meters of approved tubing.

It’s safe to say that everything you’ll need is included in this purchase, and all you’re going to need to buy next is the CO2 itself. Nevertheless, despite everything this setup comes with, the entire system is really easy to use, and you’re sure to pick it up in no time at all. Of course, instructions are included for if you have any questions!

All in all, this is a great piece of kit. While it’s one of the more expensive options, you’re paying for quality and reliability, so if that’s what you’re looking for, this regulator makes a perfect choice.

  • Comes with everything you need to get set up and using your regulator
  • Detailed instructions are included
  • Works with all tanks from 10-125 gallons
  • Dual-band gauges with clear readings for accurate CO2 management
  • Quite an expensive option

Buy at Amazon

UP Aqua CO2 Aquarium Regulator with 2 Gauges and Adjustable Valve

UP Aqua CO2 Aquarium Regulator with 2 Gauges and Adjustable Valve

Another highly rated CO2 regulator, the UP Aqua device is a no-frills valve and regulator that gets the job done without any of the fancy settings or features that advanced aquarium keepers need. This is why this is the perfect set for beginners or those shopping on a budget.

Operating this simple device is a breeze thanks to the adjustable working pressure valve and the dual-band gauges with large displays, so you can see exactly what you’re doing and how much CO2 you’re expending from your tanks.

The entire regulator is crafted using durable plastic and heavy-duty brass. This means there’s very minimal risk of this breaking, and you can have complete peace of mind that it will stand the test of time. This model even comes with a CGA320 universal connector for linking it up to your bottles.

This regulator, although simple, is designed for professional usage and is compatible with the majority of standard timers for an automatic set up and one of the most accurate CO2 regulating experiences.

While it would be nice to have more accuracy, such as selecting the exact number of bubbles like you can with the more premium units, this is a simple reflection of the price. Give this device some time to ‘break in’ as such, and learn how to use it, and you’ll be sure to have everything you need.

  • Solid build from plastics and brass
  • Designed for simple, professional usage
  • Large dials and needle for reading the gauge
  • Ideal for beginners and experts alike
  • Parts need to ‘break in’ to work properly
  • Cheaper parts compared with more premium models

Buy at Amazon

MOD Complete CO2 Regulator Aquarium Mini Stainless Steel

MOD Complete CO2 Regulator Aquarium Mini Stainless Steel

The final regulator designed specifically for your aquariums comes from MOD Complete. This is a powerful regulator that once again comes with everything you need in, such as the parts and the tools that help to grow your plants to their best and healthiest condition.

Easily the best feature of this regulator is the fact it can vary pressures accurately between 150PSI and 2000 PSI, and although the gauges are smaller, they are highly detailed, so you can get the exact reading you’re after.

This level of quality control continues thanks to the premium quality build of stainless steel that’s built to last. What’s more, you get all this while being safe in the knowledge that this is the most affordable aquarium CO2 regulator on our list.

With the ability to finely tune your CO2 input via the low and high pressures gauges, a handy needle valve and even a bubble counter, this device prides itself as being one of the top regulators available.
You’ll find benefits from this device regardless of what skill and experience level you are.

  • Integrated bubble counter device
  • Dual gauges for accurately monitoring the pressure
  • An affordable solution for everybody
  • Available pressures between 150 and 2,000 PSI
  • None!

Buy at Amazon


As you can see, when it comes to choosing the best CO2 regulator for your aquarium fish tank, there’s plenty of great options to choose from. Any of the five regulators we’ve listed above make ideal choices, and you’re sure to love how much of a difference they make with your plants.

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I have been trying to run two aquariums on the same regulator but have had problems of getting each aquarium to get the same pressure bubbles, and in the mourning after its been off all night its changes to go into one aquarium and that can kill my fish if I am not home to correct it. Has anyone tried this?