Skip to Content
Home » Product Reviews » Current Page

Best CO2 Regulator for Aquariums: Our Top Picks 2024

If you plan on injecting additional CO2 into your aquarium, then a good CO2 regulator is what you need. Stay tuned, because this is exactly what I am about to help you find. 

Best CO2 Regulators for Aquariums

Top 5 Best CO2 Regulators for Aquariums: Reviews

Let’s now take a much closer look at each of the top five best CO2 regulators for aquariums.

1. FZONE Aquarium Co2 Regulator: Our Top Pick

FZONE Aquarium Co2 Regulator DC Solenoid with Bubble Counter and Check Valve...
  • DUAL Big GAUGE! 1.6 inch big dual gauge easy to read your cylinder inner and working Pressure.
  • UPDATED SPLIT-TYPE DC SOLENOID! Newest 12 DC split-type solenoid instead AC models, more safe and...

Here we have what is likely the number one best CO2 regulator on the market at this time. Something I appreciate here is that it features an updated split style DC solenoid, as opposed to the older AC models. This makes it much safer and more stable compared to previous models.

Something I also like is that it comes with very big dual gauges that are each 1.6 inches big, and therefore very easy to read. These gauges tell you what the pressure on the inside of the cylinder is and what the working pressure is. It’s one of the most accurate models out there as well.

This is also a high precision CO2 regulator that allows you to fine tune the CO2 output to one bubble every three seconds, and it comes complete with upgraded sealing to avoid any leaks.

Yes, this is a very high-quality unit made with durable materials that are designed to last for a very long time. The hard aluminum alloy build couldn’t be better. To back this up, it even comes with a one-year warranty.


  • Great build quality
  • Dual gauges that are easy to read
  • Precision adjustments
  • Bubble counter and more included
  • Easy to operate


  • Can take some practice to properly adjust

If you are looking for a simple yet effective CO2 regulator for your aquarium, this is the number one option I’d recommend over all others.

2. ZRDR CO2 Regulator

ZRDR CO2 Regulator Aquarium 12V DC CO2 Solenoid Pressure Adjustable with Big...
  • Adjustable Direction - The fine-tuning valve has a flexible design and can freely adjust its...
  • Waterproof Solenoid Valve - Our co2 solenoid valve adopts the new integrated injection molding...

Just like with the previous model we looked at, this unit also comes with very large dual gauges that are easy to read. No matter the angle you are looking from, you should always be able to get a reading, both for the inner pressure and working pressure of your CO2 system. It is very accurate on this front, which is of course very important.

This unit also allows for fine tuning of CO2 injection, and you can tune it up to one bubble every three seconds. This kind of precision adjustment system is always very important so you can inject the correct amount of CO2 into the tank.

This CO2 regulator is also made out of very high-quality materials, including the 12 DC split type solenoid, just like with the above unit. This is supposed to be older AC models which weren’t as safe or stable.

This regulator also features a completely waterproof integrated injection molding system, therefore allowing for great reliability. Overall, I’d say that this model might just be tied for first place with the one reviewed above.


  • Good build quality
  • Precision adjustments
  • Accurate readings on dual gauges
  • Compatible with most systems
  • Decent price


  • Doesn’t work with all bubble counters

If you’re looking for a relatively cost effective CO2 regulator that won’t break the bank, this is always a good option to consider.

3. DaToo Aquarium CO2 Regulator

DaToo Aquarium CO2 Regulator with Bubble Counter Solenoid Check Valve Adjustable...
  • DaToo Aquarium CO2 Regulator: It is well known that in the aquarium, the natural content of CO2 is...
  • Accurate And Stable CO2 Output: DaToo Aquarium CO2 Regulator's precision adjustment design provides...

Here we have an even simpler and more affordable CO2 regulator than the one we looked at above, and the reason for this is because this is a single gauge model. 

Having a single gauge means that it only tells you the working output pressure, but may not necessarily tell you the inner pressure. There is however a dual gauge model available for this exact purpose.

This CO2 regulator comes complete with a micro adjustment valve located directly on top of the solenoid valve, therefore allowing you to accurately adjust just how much CO2 you are putting into the tank, and it even comes with a bubble counter included.

Although it comes in at an affordable price, it is also made out of relatively high-quality materials. It might not be the number one toughest CO2 regulator on the market, but at least it comes with a 100% money back guarantee as well as a one-year warranty. Overall, I think that for the reasonable price of this CO2 regulator it is a model worth looking into.


  • Reliable build
  • Compatible with most CO2 systems
  • Very easy to use
  • Fine adjustment dial
  • High-quality bubble counter


  • Has a single gauge

If you are fine with a CO2 regulator that just has the one gauge, then this is the one I’d recommend.

4. FZONE Pro Series Aquarium Dual Stage CO2 Regulator

FZONE Pro Series Aquarium Dual Stage CO2 Regulator Adjustable Output Pressure...
  • Dual stage construction & adjustable output pressure. Dual stage construction provides stable output...
  • Modular manifold block design. Two manifold blocks are included. Each block comes with its own...

Here we have what is by far the most advanced, durable, and expensive model on the list today. What really stands out about it is that it features a dual stage construction along with adjustable output pressure.

This dual stage construction provides you with a stable output pressure regardless of how much carbon dioxide is still in the cylinder, which helps to prevent unpredictable issues from occurring. 

The output can be adjusted anywhere between 0 and 65 PSI depending on your needs. There are two manifold blocks included here, each of which comes with its own high precision needle valve, and they can both be independently operated.

This means that you can use this unit for two separate aquariums if you see fit. It also comes with dual gauges, dual bubble counters, and dual adjustment methods. 

All in all, this is by far the most advanced unit on our list today, not to mention the most durable too. It may cost well over $150 after taxes and all other fees, but it is simply also the best unit out there.


  • Superior build quality
  • Dual aquarium capabilities
  • Very fine adjustment capabilities
  • Extremely safe
  • Very accurate readings


  • Expensive

If you don’t mind investing a bit of extra money into something that will last for many years to come and is super reliable, then this is the model I’d recommend.

5. ZUYIYI Aquarium CO2 Regulator

ZUYIYI Aquarium CO2 Regulator, Big Dual Gauges Display,12V DC Solenoid with...
  • ✅【Application scenario】Our Aquarium CO2 Regulator is designed specifically for aquariums,...
  • ✅【Safety & High Precision】Equipped with a high-precision aquarium-specific needle valve, our...

Going back in the other direction, here is a more basic CO2 regulator, albeit it comes with all of the features you need to get started. This is a 12 Volt DC solenoid, which means that it tends to be much safer than the older AC models. 

Something that I really like about this model is that it comes with a no-return bubble counter that comes complete with its own check valve to stop water from pouring into the bottle.

I also appreciate that this CO2 regulator features two pressure gauges so you can easily read the cylinder pressure and the output pressure, and moreover, these gauges are designed to be extremely accurate, so you never have to worry about extreme inaccuracies.

All in all, this is just a really safe and highly precise unit, as it features an aquarium-specific needle valve that you can fine-tune for an output flow rate of one bubble per three seconds. Although it might not have any super special features, it is reliable, durable, it doesn’t leak, and easy to use as well.


  • Easy to use
  • Reliable build
  • Ability to precisely adjust output
  • Accurate readings on gauges
  • User-friendly design


  • Single gauge

If you’re just looking for something basic that gets the job done, this is it.

CO2 Regulators for Aquariums Buyers Guide: What To Look Out For

There are a few important factors to look out for when purchasing CO2 regulators for aquariums, so let’s find out what these might be.


Although there are other materials that can be used for these products, something like aluminum alloy should do just fine. It’s lightweight, durable, and affordable. Other metals such as stainless steel and titanium may also be acceptable given the right circumstances.

Precision Adjustments

The CO2 regulator in question should also allow you to perform precision adjustments to the amount of carbon dioxide being injected into the fish tank. You should be able to tune it to one bubble every three seconds, with some models being even more precise than this.

Oxygen diffuser under water pumping a lot of small bubbles

The Bubble Counter

There should always be a good bubble counter included so you can see exactly how much CO2 is being injected into your aquarium.


There are some different sizes of regulators out there, as well as different sizes of CO2 systems and CO2 tanks. Therefore, you need to make sure that the threading on one will fit the other.

The Solenoid

You should also look for a CO2 regulator that has a good solenoid valve, as this will determine how easily you can turn the supply of CO2 on and off.


Although the cost is generally not the most important thing I look out for when purchasing a CO2 regulator, in this case, I do recommend keeping the price in mind. The reason for this is because I recommend not going for the cheapest model out there. These are fairly complex items and they need to be built really well.