Best Aquarium CO2 Regulators 2022 – Reviews & Buyer’s Guide

1. Aquatek Co2 2. Charlotte’s Web 3.  NuLeaf Naturals

When you install and maintain your aquarium, you need to make sure that the CO2 level is perfect for all your plants. To cover this aspect, you will have to invest in special equipment called a CO2 regulator and add it to your aquarium properly. When it comes to finding the best aquarium CO2 regulator, things are not as simple as it might seem. The market offers plenty of products to choose from, and if you are not an expert in the matter you might find this process overwhelming.

But this complex guide will give you all the information you need to find the best product and at the most convenient cost. You will find out why you should invest in such a regulator as well. And finally, you will find valuable information regarding the most important aspects to consider when you need to make such a purchase.

What Is Aquarium CO2 Regulator?

An aquarium CO2 regulator maintains the CO2 settings in your aquarium at proper levels for both your fish and plants. Too little CO2 will kill your plants while too much of it will harm your fish. The balance can be found and maintained by adding a CO2 regulator to your aquarium. This product makes sure to keep the CO2 to the best level and with little to no effort on your side.

You can check the CO2 level by glancing at the regulator that you have installed. When you notice that it is not where it needs to be, you adjust it. You will have to inject an appropriate CO2 level and allow the regulator to do the rest.

Your regulator will convert the CO2 into bubbles that will be added to your tank. This way, both your plants and fish will benefit from it! Also, you will stop the algae growth, which is so disturbing!

Why Do You Need The Best Aquarium Co2 Regulator?

You need a CO2 regulator to keep the CO2 level under control. Such a product will save you from a lot of measuring work that you will have to do to determine what the CO2 level is. It will also feed your plants and fish with the perfect conditions for living inside your aquarium.

Most likely, you already know that you have to add the CO2 needed in your aquarium. Unlike the natural environment, a plain aquarium doesn’t provide the right CO2 level that the plants need. So, you will inject it yourself and also regulate it. When it comes to regulating, a CO2 regulator can be a true lifesaver!

Unless you are very experienced in setting up the right amount of CO2, you shouldn’t take any risks. If you make a mistake, you can harm your fish and plants in just a matter of hours.

A CO2 regulator will assure you that both your plants and fish stay healthy inside the aquarium but also the algae grow this kept under control. All aquarium owners know that algae can damage the beauty of your tank and affect your fish and plants. So, don’t neglect this aspect!

If you want to find the best aquarium CO2 regulator, get ready for reading through a lot of product descriptions. Or, you can check the list we prepared for you and save a lot of time. The following CO2 regulators are some of the most appreciated and efficient products on the market.

Top 10 Best Aquarium Co2 Regulators 2022

1. Aquatek Co2 Regulator Mini

Aquatek Best Aquarium CO2 Regulators This CO2 Regulator is very efficient and easy to use. You will be able to connect it to any paintball CO2 tank without needing an adapter. You will not need assembly either, which makes it even easier to set up.

However, you need to keep in mind that you don’t receive such a tank in the package. They are very easy to find online, as many users ask for them. You should fill up the tank before adding the CO2 regulator to it. When you purchase it, it will be empty.

This regulator also comes with a highly precise needle valve. This allows just the right amount of CO2 to be dropped. You will not have to purchase the bubble counter separately as this is included in your order. And the bubble counter also comes with a check valve. This regulator is adaptable to almost all types of CO2 diffusers and atomizers.

It comes in a classic shade of black that will make it suitable for any aquarium. And the solenoid design feels very pleasant to the touch. This regulator is resistant enough to last you for a long time. You will not need to invest in its maintenance and cleaning it is very easy as well.

It is just the type of product you need for your fish and plants to grow healthy. And for all the qualities that it comes with, the price is very budget-friendly so you will not have to worry about the cost.


  • Bubble counter included in the package
  • Check valve included
  • Compatible to most CO2 diffusers and atomizers
  • Budget-friendly product
  • Made of resistant materials
  • It comes with all the tools you need to install


  • The levels of CO2 might not stay settled for long time
  • Customer service is not as responsive as some clients expect

2. Aquarium CO2 Regulator Mini Dual Gauge

Aquarium CO2 Regulator Mini Dual GaugeOne of the best aquarium CO2 regulators is this model from DoubleSun. It is perfect for your aquarium, and you will enjoy better plants and healthier fish for a longer time. You can choose it in the blue or black color according to the design of your aquarium. This product is designed with superior quality material and also for long-lasting dependability and durability.

All you need to install this regulator is included in the package. You will not have to make any further purchases to set it up. The display that this regulator comes with makes it very easy to read the settings of your aquarium. You will know at all times what the CO2 level is.

Based on this information, you will decide how much CO2 you have to inject. Plus, this product also comes at a very affordable price. You will not have to break the budget to invest in it. This might be the best product you can get with such attractive features. It is perfect for beginners who have never used a CO2 regulator, but experts will appreciate it too.


  • Easy to install CO2 regulator
  • Easy to read due to its dual gauge display
  • 220-240V AC Power
  • Suitable color and size
  • Comes with a durable and sturdy solenoid valve body
  • Safe and high-pressure resistance


  • It doesn’t support global shipping
  • Customer service might not be as responsive as you expect

3. S.T. International Aquarium 2-Gauge Professional

S.T. International Aquarium 2-Gauge ProfessionalYou will love the fact that this aquarium CO2 regulator comes with a decompression pressure gauge that you can adjust. This regulator will offer a clear CO2 output at all times.

You can use this product along with disposable cartridges which are very convenient. The valve it comes with is magnetic and patented solenoid. You will fall in love with the efficiency of this regulator, and your fish and plants will thank you for it.

This product will also help you save energy as you use it. There is no unwanted heat that comes out of this product. You can use it safely for a long time with minimum maintenance. Also, you don’t have to worry about any noise because this regulator is a very quiet one.

Make sure to check the tank sizes that this regulator can accommodate. If your tank is too big, the results might not be the same. Once you start using this product, you will see that it is the best aquarium CO2 system for you! Take care of your fish and plants with this professional CO2 regulator!


  • Easy to install as it comes with all the tools you need
  • Saves energy
  • Magnetic valve
  • You can use it with disposable cartridges
  • Adjusting pressure gauge


  • It might not work just as good with all tank sizes

4. U.P. Aqua Co2 Regulator For Aquarium

U.P. Aqua Co2 Regulator For AquariumIf you are looking for a CO2 regulator for your aquarium, this model from UP Aqua is another good choice. It is not one of the cheapest products on the market, but it is an investment worth making. It has a pressure level that is easy to adjust according to your convenience.

This CO2 regulator also comes with a valve for decompressing the pressure level. The connector of this regulator is CGA320, and it is also made of heavy brass.

The construction and the features of this CO2 regulator makes it one of the best choices on the market. It comes in a black color which will blend in with any aquarium. The weight of this product is only 907g, and the dimensions are 15.9 x 11.4 x 11.4 cm.


  • It has a decompression valve
  • The connector is CGA320
  • Made of resistant brass material
  • It comes in black color


  • Some users claim that it can break sooner than expected

5. Fzone Aquarium CO2 Regulator

Fzone Aquarium CO2 RegulatorAnother model of aquarium CO2 regulator from Fzone is this one that comes with all you need. This regulator is a triple-stage one which is the best type that you can get nowadays. The pressure is adjustable, and the flow rate will remain constant. This gives you the best results at all times.

You can set the pressure between 0 and 60 PSI. The 12V DC valve that is solenoid is a lot safer than the AC ones, and it also offers more stability. The regulator comes with a timer so it can turn on and off without you having to worry about it. It is very quiet as well, and it will not disturb you while it is on.

This regulator can release 1 bubble every 3 seconds, which is a great frequency. The bubble counter that comes with this product is very efficient as well. You get all you need to set it up, inside the packets. You don’t have to invest in any other tools. This is a product made to last for a long time. It has a sturdy aluminum alloy that allows it to have a long lifespan. This is the best CO2 regulator that you can find under $100.


  • Triple stage regulator
  • It comes with all you need to install it
  • Very quiet product
  • Bubble counter included
  • Safer than other regulators


  • It might leak CO2

6. Vivosun Hydroponics Co2 Regulator

Vivosun Hydroponics Co2 RegulatorThis product is so much more than an aquarium CO2 regulator! You can use it in your grow room or grow tent and also in your aquarium, and it will offer perfect results. The heavy brass material used to create this regulator makes it a very long-lasting one.

You will not have to worry about any rust or damage for years to come if you use this product. The pressure gauge is 1.58’’ high and the PSI can go from 0 to 4000. The CGA-320 is the right inlet connection, and you will be able to use this product as soon as you install it.

You can increase the growth rate by 40% by using this regulator and adjusting the CO2 level. Everything you need to install this product comes in the package. You will also get all the instructions to do that step by step. The design of this regulator is also very convenient. You can check the settings at a glance and adjust it as you want.


  • It can be used in grow rooms or tents as well
  • Easy to install according to the instructions
  • The PSI can go from 0 to 4000
  • Convenient design
  • Very resistant heavy brass material


  • The CO2 might change levels if you don’t check it often after you set it up

7. Jardli Aquarium Co2 Regulator

Jardli Aquarium Co2 RegulatorJARDU offers the best aquarium CO2 regulator that will help you adjust the levels of CO2 as you need. This product is made of aluminum and stainless steel so it will last you for a long time. It will not take much space either as it comes in a mini version.

The integrated valve is a 12V DC Solenoid one, and it is integrated into the regulator. You will save energy, and there will be no noise as you use this product. The Solenoid comes with an LED that is red in color, and it is very useful on and off indicator.

The CO2 output is very accurate, and you will know at all times what are the settings of your aquarium. The PSI can go from 0 to 10, and it is perfect for any aquarium size. You can use it easily for 20 L aquariums or as big as 1500L. It is compatible with most tanks thanks to the CGA320 interface.

Along with this product, you get Paintball CO2 adapter as well as CGA320 thread connection. You get all you need to install this regulator right out of the box. Overall, this can easily be the best aquarium CO2 system that you can use.


  • Red LED to indicate on and off states
  • It comes with all you need to add it to your tank
  • Made of resistant materials
  • It will help you save energy
  • Very silent product


  • The CO2 flow might not remain constant

8. DoubleSun Hydroponics Aquarium CO2 Regulator

DoubleSun Hydroponics Aquarium CO2 RegulatorThis CO2 Regulator can make a great difference for your tank and the fish or plants you have in it. The CO2 output is stable and very accurate, so you are not left guessing on this matter. You can easily adjust the pressure as this regulator comes with a decompressing gate.

The pressure level can go anywhere between LP 150 PSI to HP 2000 PSI, and you can measure CO2 level with no hassle. This product is made to last. All the materials used for it are resistant and durable so you can enjoy it for years!

You will be happy to discover that this regulator is compatible with most tubing systems. It is easy to add to different diffusers and atomizers for CO2 as well. You shouldn’t have any problem installing this regulator or injecting the CO2 that you need.

You will admire your plants growing faster and developing a lot better with this regulator. Also, you will get rid of algae invasions, and you will protect your fish at all times!


  • Made of resistant materials that will last for a long time
  • Easy to set up if you follow the instructions
  • Helps you reduce algae invasions
  • Your plants will grow in a much healthier environment
  • No risks for your fish
  • Compatible with most tubes


  • The gauges might be too small

9. Aquarium CO2 Regulator, Dual Gauge Display

Aquarium CO2 Regulator, Dual Gauge DisplayAnother product that can easily become the best aquarium CO2 regulator is this one from WYIN. It comes at a very budget-friendly price compared to the useful features that it offers. You can choose between a model with big dual gauge or one with a pressure regulator.

The decision depends on your needs. But for aquarium use, the big dual gauge is the optimum version that you might want to invest in. The color of this product is black, which makes it suitable for all tanks, regardless of their design.

You should check the recommendations of this regulator, so you use it along with the right system. For instance, it will work only with 110V AC Power which is a very important detail! This regulator will match the CO2 bottles according to the US Standards and CGA 320 interface.

If you pay attention to these aspects, there is no reason not to enjoy this product. All the tools you need are included in the package. This product is very easy to install, and you can start using it in a matter of minutes. You have to pay attention to the amount of CO2 that you inject in your tank.

The well-being of your fish and plants depends on this aspect. This regulator allows you to read the CO2 levels easy and with no hassle. So, you will know when you have to adjust it!


  • It will match the CO2 bottle according to US Standards
  • It comes with all you need to install it right out of the box
  • The black color which is perfect for any design you might have in your tank
  • You can check theCO2 levels easy
  • Adjustable pressure
  • Resistant materials
  • It comes at a budget-friendly price


  • The pressure level might not stay constant

10. MOD Complete Aquarium CO2 Regulator

MOD Complete Aquarium CO2 RegulatorAnd last but not least, this MOD Complete aquarium CO2 regulator. This is also a very popular product and highly appreciated by users. It comes with all the tools you need to install it with no hassle.

This CO2 regulator will also help you to make sure that you add just as much CO2 to your aquarium as your plants need. You will be able to adjust the CO2 level at any time. The blue stainless steel material used to create this product will make it last for a long time.

The range of pressure of this regulator goes from LP 150 PSI to HP 2000 PSI. You can check the status of your CO2 by simply reading the digital display of this regulator. Overall, it is easy to set up and use the product, and you will fall in love with its features. Your fish and plants will benefit greatly from this CO2 regulator!


  • Digital display for easy readings
  • Made of resistant stainless steel material
  • Easy to install
  • The pressure between LP 150 PSI to HP 2000 PSI


  • Low-pressure gauge might not be as resistant

How To Choose the Best CO2 Regulator?

You don’t just need any CO2 regulator. You need the best one according to your aquarium and the needs of your fish and plants. If you have never invested in such a product, you might find it challenging to choose the best aquarium CO2 regulator. But you will find it a lot easier if you consider the following aspects!

1. Installation

You should choose a regulator that is easy to install, especially if you are a beginner when it comes to using these products. Starting off on the right path is very important when you add a CO2 regulator.

Generally speaking, CO2 regulators are not difficult to install. But you should check to see if they come with the tools and instructions that you need. The manufacturer will specify if the package comes with such tools in the product description. So, always read this description before purchasing.

If your desired product doesn’t come with all you need, check and see if you can purchase the tools easily. You might have some of them in your house. If you don’t have the right tools, improvising can be frustrating and create a real hassle.

2. Readability

To read the CO2 settings easier, you should consider investing in a regulator that comes with a digital display. Such a display allows you to read the CO2 information at just a glance, and this can be very important. Reading the gauges can make all the difference when you are using a CO2 regulator.

The best CO2 regulator will come with the possibility to read it very easy. There are also regulators that have an LED to let you know if they are on or off. And such functions can make the difference between an average product and a high-quality one!

3. A Dual-Stage or Single-Stage Regulator

The market nowadays offers dual-stage regulators which are two regulators in one product. In these regulators, one stage gets the pressure to a certain PSI level, and the other stage takes care of different details to adjust it. With such a system, you will not have to deal with any variations.

Your pressure will always be where it needs to be. And your settings will remain constant and accurate. The single-stage ones tend to be more budget-friendly but they come with certain risks that you need to consider. Evaluate your budget and needs before you make such an investment.

4. Compatibility

The CO2 regulator needs to be compatible with your aquarium system. You should go for a regulator that can suit more types of tanks to make sure that you are not wasting any money. Get a regulator that is proper for CO2 cylinders or paintball cylinders.

You can find them rather easily as they are requested by many buyers. Some regulators also come with the needed adapters to add them to your tank easier. But you should also consider the size of your tank. Not all CO2 regulators will fit all tank sizes. And if your aquarium is too big, your regulator will not give you the expected results.

5. Materials

The lifespan of your CO2 regulator is a very important aspect. You should always try to invest in products with a long lifespan. And a great indicator of a long lifespan is the material of the regulator. To be confident that the quality of your product will last for a long time, you should choose one made of heavy brass or stainless steel. These are considered the best products on the market.

There are also regulators made of aluminum alloys that can withstand the test of time. Read the description of the product carefully and find the information you need.

Benefits Of Using CO2 Regulator In Your Fish Tank

If you decide to invest in a CO2 regulator, you will have many advantages from it. Using such a CO2 regulator can radically change the maintenance of your aquarium for the better. It will ease your job when it comes to taking care of your plants. Here are the most important benefits of having the best aquarium CO2 regulator!

1. The Health of your Plants

The right level of CO2 will support your plants in their developing process. CO2 is an important aspect of photosynthesis, and regulated right, can make the plants bloom. Your plants will get some CO2 from the fish in the aquarium, but they can’t rely on just that. You will also need to inject some and make sure that you regulate the levels of CO2 properly.

2. The Health of your Fish

Not only your plants are dependent on the CO2 levels in your aquarium but also your fish. If there is not enough CO2 or too much of it, your fish will die. Also, if there is too much CO2 in the water, the toxicity level will increase, and the pH level will be negatively affected. Using a CO2 regulator helps you avoid such consequences and keeps your fish happy and healthy.

3. No More Uncontrolled Algae Growth

Algae growth is a challenge for most people who decide to have an aquarium. If your CO2 levels are not right, your aquarium might be taken over by unwanted algae, and also a high level of ammonia. Both these aspects will affect your fish and your plants to the point of killing them if you don’t keep it under control.

How To Use CO2 Regulator Aquarium?

Now that you are aware of the importance of using a CO2 regulator in your aquarium, you need to know how to set it up. This phase is not difficult at all, so there is no need to worry. Here are the most important steps to follow in the process.

Step 1: Get the CO2 regulator connected to the cartridge

The chances are that your CO2 regulator will be suitable for most cartridges on the market. You shouldn’t have to invest in any additional tools. But it will help to check the description of the product that you are about to invest in, to make sure that there are no issues.

Step 2: Connect the air outlet

If you invest in this perfect aquarium CO2 system, it most likely comes with a bubble counter. But if your CO2 regulator doesn’t come with this, you can add a different bubble counter to it. You will need a diffuser to add it to the end of the regulator. This diffuser converts the CO2 in bubbles that can get in the water. And to connect the regulator to the air outlet you will need a special tube that should come with your product.

Step 3: Choose the right position for the diffuser

Remember that the diffuser is ultimately responsible for distributing the bubbles into the water. Make sure to place it in the tank area where water circulates the most.

Step 4: Add a drop checker

A drop checker is essential to see the concentration of CO2 inside your aquarium. This will help you adjust it when required. Keep in mind that the best concentration you want is 26 to 35 PPM. To add the drop checker inside your tank, you will need a suction container.

Finishing Touch

The conditions that you create in the aquarium are essential for the well-being of your fish and plants. You can’t get away without having the right level of CO2 at all times. And if you would have to keep it under control without a regulator, it would be much harder. To save yourself time and frustration, it is wise to invest in one of these products. In the complex list above, you will find the best aquarium CO2 regulator at the best price as well.

Offer your favorite fish and those beautiful plants the perfect conditions to develop healthily! The best CO2 regulator aquarium will help you save time as well as stay on top of certain issues. You will not have to worry about the CO2 levels with such a product.

All you need to do is supply these levels with the right amount of CO2 if they get too low. But, you will find all the instructions in the products descriptions, so you don’t have to worry about it.