Planted aquariums are different from non-planted and only fish setups. There are some precautions and additional measures that you must take to maintain a planted tank and facilitate the growth of the plants.

One of the many measures is the proper regulation of carbon dioxide levels in your aquarium. CO2 plays a vital role in the growth of your plants as well as fish. If not maintained properly, it can result in unfavorable conditions.

A low level of carbon dioxide can lead to the death of your plants. In contrast, a high level can result in the death of your fish and promote the growth of algae, which can further cut off the oxygen flow inside your aquarium and enhance oxygen deficiency.

For these reasons, it becomes important to regulate the CO2 concentration in your aquarium. Luckily manufacturers and engineers have designed efficient Aquarium CO2 regulators that can proficiently control the CO2 level.

But the challenge arises while selecting a proper CO2 regulator for your aquarium, as there are a plethora of companies that design and manufacture these products, and identifying a genuine and suitable product among them becomes quite difficult.

For those who are new to fish keeping as well as those who want to know more about CO2 regulators so that they can find the ideal one for themselves, we have tried and tested numerous products to find the best among the best.

We did find some amazing products in this category and have compiled them into a neat list that might help you. Among the top products, we found FZONE Aquarium CO2 Regulator to be the champion.

But to keep the variety going and offer you a wider range of designs and styles, we have included nine more amazing CO2 regulators for your aquarium. So without wasting any more time, let’s jump right into the list.

10 Best CO2 Regulator for Aquarium- Reviewed

All the products mentioned here are available online on

FZONE Aquarium CO2 Regulator

Product details:

  1. 12V DC
  2. Dual gauges
  3. Hard aluminum alloy

People relate money with quality, despite the fact that the bulk of the huge “high end” name brands are manufactured in the same facilities using the same parts as the “cheap” ones.
This is a regulator that fits in perfectly with it.

I have four high-tech tanks in different rooms; thus, regulators in each room are required rather than a single larger tank with a splitter. The needle valves require some fine-tuning, but after a short time, you’ll have it dialed in, and the valve will stay in place without needing to be returned.

This is a microcontroller. The solenoid works well and is compatible with any electric timer. They’re small and compact, so they don’t add much bulk to the top of your tank, making them simple to install on your stand.

But here’s the greatest part: it’s incredibly low-key. It functions in the same way as any other full-size regulator on the market. I filled the bubble counter with water and could easily read the bubble count. It’s a reliable regulator.

My plants are sprouting. It’s incredible to watch them develop and grow in such a short period of time. If you’re considering whether or not to buy a regulator, look no further.

What we like:

  1. Updated solenoid
  2. Precise control

What we dislike:

  1. Gauges are small

VIVOSUN Hydroponics CO2 Regulator

Product details:

  1. Brass components
  2. 1.58″ high pressure gauge
  3. 4.2 mm hose diameter

The regulator works excellent, but before you use it for the first time, remove the plastic tube, apply Teflon tape to the threads, and screw it back in only hand tight. When screwing it around, be careful not to cross-thread it. If you don’t, even with the solenoid closed, it will leak all of your Co2.

It is a well-made CO2 regulator. It is made of solid brass and comes with all of the necessary lines for installation. The output monitor is accurate, and it responds nicely once dialed in and connected to power.

This is what I use to connect my CO2 apparatus to a freshwater tank. I like that this is made of brass, which is far more robust than aluminum, as is the case with aquarium-specific products. It is simple to set up and works well. It works great, and I have yet to encounter a stuck solenoid.

I’ve had the unit for about a year, and it works as it should and is less expensive than others on the market.

What we like:

  1. Durable brass components
  2. Cheaper

What we dislike:

  1. Sensitive adjustment

AQUATEK CO2 Regulator Mini

Product details:

  1. Cool-touch
  2. Solenoid design
  3. Precision needle valve

I bought it a year ago, and it’s still going strong after a year of constant use. This is linked to a 20oz Tippman and a 24oz Tippman CO2 tank. According to my knowledge, these tanks were initially built for paintball use, but I currently use both of mine for injecting CO2 into my planted nano aquariums.

According to the Aquatek regulator’s design, it required no adaptor. I have it set to a timer. My CO2 tank is turned on one hour before my lights turn on, and it is turned off one hour before the lights turn off. My lights are currently turned on for eight hours.

I have a three-way Aquatek splitter, and two lines are connected to diffusers. The 20oz tank lasts approximately four weeks, while the 24oz tank lasts about six weeks. That seems appropriate for my application, and it only costs me a little less than $6 to fill my tanks.

I am quite pleased with how my regulator has behaved thus far. When compared to Fluval’s C02 system, which can only sustain a tiny tank, the price is relatively reasonable. This regulator can support a 30-gallon tank.

The problem is that the tank is generally too small and not the regulator. Thus you end up replenishing it more frequently. This is also far less expensive than acquiring a 5lb or 2.5lb C02 tank regulator.

What we like:

  1. Cool-touch design
  2. Cheaper than other products

What we dislike:

  1. Difficult to adjust

Titan Controls Carbon Dioxide (CO2) Regulator

Product details:

  1. 120 volt controllers
  2. Flow meter – 0. 5 to 15 SCF/hour
  3. Oil-less pressure gauge

Regardless of what the instructions indicate, you must use Teflon (plumber’s) tape if you don’t want leaks. A wrench is also required to tighten the bolt 1/2-1 turn past hand tight.

If the flowmeter was properly fitted, the tank should not be leaking or emptying until the solenoid is connected in and both the main tank valve and the smaller knob are turned to the left.

The CO2 rushes quite quickly; keep the smaller knob turned no more than a quarter turn until the flowmeter reads 2. Purchase a CO2 detector. In your grow room, aim for 1400 ppm. If your grow space is indoors, CO2 will enter your living rooms. Turn off your tank by mid-evening, or set a timer.

For my planted tank, I’ve set it to an 8-hour cycle. If needed, you can reduce the rate down considerably below one bpm. It’s a little risky to set that low, but once done, it’s solid.

What we like:

  1. Highly durable
  2. Precise control

What we dislike:

  1. A bit tricky to setup

DoubleSun Aquarium CO2 Regulator

Product details:

  1. 12V DC split-type solenoid
  2. Dual Gauges
  3. Hard aluminum

I’ve been using this for a few months now to see how it holds up over time, and it’s been functioning beautifully and consistently. I haven’t had to tweak the needle valve much, and it’s still constant.

Because this is a lower-cost alternative to competing items, it is slightly rough around the edges, which is to be expected. As others have pointed out, the solenoid runs hot, which is unusual.

This is fantastic because there is only one adjustment knob. As a result, it is set to predefined working pressure. This is connected to a paintball tank through an adapter and works perfectly. The one thing I don’t like about the solenoid is how loud it is when it turns on or off.

The most serious criticism I have is that the plug is grounded. Practically all plug-in timers lack a ground slot. As a result, you must obtain a special heavy-duty timer or manually ground it and convert the plug.

What we like:

  1. Highly precise
  2. Affordable

What we dislike:

  1. Small meters

YaeTek Aquarium CO2 Regulator

Product details:

  1. 150 PSI – 2000 PSI
  2. Solenoid 110V
  3. Bubble Counter

I purchased this tiny beast, and it has worked well for the past month. It has a high-quality feel and appearance. It does have a low-frequency hum, but it’s within a cabinet, so I can’t hear it from outside. It’s on a digital timer and turns on automatically every day.

I discovered no leaks throughout the testing. I didn’t use the bubble counter on it since I have a 20oz tiny tank that sits upright with the threaded connection on top, which I connected with an adaptor.

I’m not comfortable turning a tank on its side. As a result, I purchased a separate bubble counter. In that manner, liquid CO2 may reach the regulator. This will not be the case for those who utilize 5lb tanks, as the threaded connection is on the side.

Quality materials, a nice regulator, set at around 30psi, a bubble counter with a check valve, and a needle valve that works properly. Overall, for the price, this regulator is as good as it gets. It comes highly recommended.

What we like:

  1. High quality build
  2. Worth the price

What we dislike:

  1. Difficult to setup

FZONE Pro Series Aquarium Dual Stage CO2 Regulator

Product details:

  1. 0-65 PSI
  2. 12V DC Solenoid
  3. Two manifold blocks 

I have a 55-gallon freshwater tank that is highly planted and has a moderate fish population. I have ample sunlight and fertilizer in the tank, but I needed a carbon source to help plant development.

So I had to use a CO2 regulator, but I wanted to try out a new design, and I went for FZONE as this is one of the most trusted brands, and after using another model from this brand, I was highly impressed, so I expected the same for this product, and honestly, I am really satisfied.

This regulator includes a standard CGA320 connector that screws onto standard CO2 tanks, such as the one I picked. Adapters are available to allow you to use this regulator with smaller tanks such as paintball tanks, Soda Stream tanks, or even throwaway tanks.

Standard CO2 tanks, on the other hand, are more cost-effective for tanks 55 gallons and greater. The regulator has two levels of regulation as well as two gauges to monitor tank pressure and delivery pressure.

Furthermore, you can change the delivery pressure. The dual-stage regulator maintains consistent delivery pressure and eliminates the danger of an end-of-tank CO2 rush, which can injure cattle in the tank.

What we like:

  1. Fantastic price.
  2. Beginner-friendly installation

What we dislike:

  1. Not for small tanks

Doublesun 110V Aquarium CO2 Regulator

Product details:

  1. LP 150 PSI /HP 2000 PSI
  2. Mini dual gauge display
  3. CGA320 inlet connection

Everything appears to be in order and is still in great shape. It is connected to a co2 320 adaptor and works with an 88g threaded co2 tank. The solenoid created a loud humming sound when I first plugged it in.

When I returned an hour later, the solenoid was still humming. I expected it to be gone in a few minutes. It turned out that I had twisted the solenoid too tightly; a simple twist and the solenoid humming noise was gone.

It gets hot when the regulator is a high-quality device that I recommend to anyone searching for a dependable solution. When it comes to temperature, but only if I leave my finger on the solenoid for a few seconds. This is excellent value for money. Make certain that you have read the instructions.

It does get warmer than room temperature, but this appears to be normal. The adjustment needle is pinpointed exactly at first, so don’t fiddle with it too much, or it will become loose.

What we like:

  1. It is very affordable
  2. Easy to install

What we dislike:

  1. Sensitive bubble counter

S.T. International Aquarium Professional CO2 Regulator

Product details:

  1. Solenoid magnetic valve
  2. Decompression pressure gauge
  3. 110V

I purchased this over two months ago when I upgraded my CO2 tank to a larger CO2 cylinder (I have a 30-gallon tank. It works flawlessly. Very simple to set up, pressure is consistent, and there are no difficulties, which is what I was most concerned about after reading reviews of some of the less expensive regulators.

So far, everything appears to be in order; the timer works dependably. It is stable and does not require recalibration once set to the desired number of bubbles per second. There are no Co2 bursts when it comes on in the morning.

The adjustment for the number of bubbles is quite fussy and delicate, which is only a little irritation. In my 15 gallons tall tank, I bubble one every 2 to 3 seconds, and changing it was a frustrating exercise because moving the knob was a matter of half a millimeter one way vs. half a millimeter the other.

However, once set, I’ve never had to alter it again. It’s a highly responsible solenoid and valve. Don’t forget to install a check valve to prevent water from entering the mechanism.

What we like:

  1. Highly effective
  2. Energy efficient

What we dislike:

  1. Expensive

FZONE Aquarium CO2 Regulator Mini Series

Product details:

  1. 12V DC solenoid
  2. Hard aluminum alloy
  3. Aquarium specific needle valve

I’ve had high-tech planted tanks for almost six years. I’ve tried regulators from a variety of manufacturers, but FZONE has always been my personal favorite. I’ve used numerous goods from this business and have been quite pleased with all of them.

The Fzone regulator is intended to be mounted on a vertical cylinder, such as a paintball cylinder or some fire extinguishers. Having said that, it worked perfectly on my spare 10lb co2 tank for testing.

Its build quality is excellent, its design is perfect, its assembly is simple, its use is amazing, and its value is unsurpassed. I like how compact and sleek it is and how nice it is built. Although the needle valve is not the best globally, you may use it to fine-tune even at 40PSI.

It has a built-in Permaseal kind of O-ring and a filter to trap particles. It comes with extra rubber O-rings and the tools needed to put it together. Once installed, the bubble counter is difficult to remove; this isn’t a significant concern, but it’s worth noting.

What we like:

  1. Very budget friendly
  2. Durable built

What we dislike:

  1. Bubble counter may leak

What should be considered while buying a CO2 regulator for an aquarium

In case you have a planted aquarium, you will need to supply carbon dioxide to the tank to stimulate the flora and help them grow and become healthy. But, if you give too much CO2 to the environment, your fish may perish. If there is too much co2 in the water, your fish may appear intoxicated.

A CO2 regulator is required to reach and stabilize the proper level of CO2 in your aquarium. A regulator is a straightforward gadget that sits between your CO2 tank and aquariums. It normally has one or more gauges on it to tell you how much CO2 is left, and it may also include other parts, such as a bubble counter.

So let’s discuss and understand the factors that affect the functionality of a CO2 regulator so that you can bring the best out of your product.


As the co2 exits the compressed cartridge, it is exceptionally cold and can rapidly injure the skin, thus never exposing an unchecked valve.

While introducing Carbon dioxide to your tank is not typically deemed unsafe, but there are some precautions you must take to ensure there is no risk. We advise repeating the soapy water test on all apparatus on a periodic basis to identify that no Carbon dioxide is leaking into the atmosphere.

The gas is not harmful, but if there is a large amount of it in a confined space, it can drive out the oxygen. Oxygen depletion is particularly dangerous in compact, enclosed environments such as rooms.

How to perform soapy water test?

To do the soapy water test, combine one tablespoon of liquid detergent with one cup of water. Brush the water over the joints and pipes using a tiny paintbrush. If bubbles emerge during spraying, there is a leakage that needs to be repaired.

FZONE Aquarium CO2 Regulator is the best product when it comes to safety and build quality.

Quality and longivity

The strength of the metal used in your aquarium. The CO2 regulator is probably the first thing you should consider. Superior quality metals are typically made of brass or hard aluminum, and you should also inspect the connections, seals, and gauges for excellent quality.

Check for any broken or deformed connections, as they might cause early damage. FZONE Aquarium CO2 Regulator is made of hard aluminum alloy that is also corrosion-free and offers excellent longevity.

User friendly

When it comes to ease of use, it means two things: First is the easy installation process and components that are precise, available, and built according to measurement standards in your country.

This is especially significant with the presence of an online market where there are several products from a wide number of countries. And in our review, we have tried to include those that can go with any kind of American product.

There are two components to being simple to use. It must be simple to install and have all of the necessary fittings. Connectivity is usually not an issue, but it’s much easier to buy a model from a country with a different measuring system with internet sales.

The second aspect of usability is how simple it is to restrict the flow of Carbon dioxide in your aquarium. Several variants have incredibly delicate knobs that are difficult to position where you want them.

Doublesun 110V Aquarium CO2 Regulator is very easy to install and maintain.

Proper components

It is important to ensure that you receive the parts of the product properly else you will be left with a fault or a useless device.


Typically, aquarium carbon dioxide regulators include one or two gauges. A single gauge indicates the amount of Carbon dioxide left in the aquarium. Another gauge, if designed in it, shows the pressure that is forming in your aquarium.

Also, you must check for the accuracy of the gauge; else, it might lead to excess or low level of CO2, which, ironically, you are trying to avoid.

Needle Valve

Needle valves or pressure relief valves are meant for achieving accurate control of the CO2 supply to your aquarium. The measurement on these comes as bubbles per second which is related to the amount of carbon dioxide being supplied.

Bubble Counter

Not every product includes this component, but if it does, it is an advantage and additional feature that will help you control the CO2 flow. A bubble counter measures the amount of CO2 being supplied to the tank.

We highly recommend a bubble counter s this will enable you for a better and more precise CO2 regulation and control.


To manage the CO2 supply, your device must have an electrical solenoid. An automated system is better than a manual system as it is more reliable and can ensure more stable Carbon dioxide throughout time.

Titan Controls Carbon Dioxide (CO2) Regulator offers all these components are well-made with high efficiency.


What pressure should CO2 be in aquariums?

The pressure-lowering valve takes an 800 – 1000 PSI pressure and adjusts it to deliver a regulated, lower pressure flow in the range of 1 – 40 PSI. This is the ideal pressure range for any aquarium setup.

How do you adjust a CO2 regulator on an aquarium?

To adjust a CO2 flow in your aquarium, you need a needle valve that can control the amount of CO2 introduced.

How do I circulate CO2 in my aquarium?

A diffuser provides an efficient way for CO2 to supply the aquarium.

How long should I run CO2 in my aquarium?

It is recommended to start the CO2 supply one hour after the lights turn on and turn it off one hour before the light comes off. I’d start it one hour before the lights came on.

Our Verdict

If you are looking for a CO2 regulator for your aquarium, we highly recommend our top pick: FZONE Aquarium CO2 Regulator. It features two easily readable gauges, a DC solenoid and a check valve. It is simple to install and operate.

If you’re on a tight budget, this is our best deal. The VIVOSUN Hydroponics CO2 Regulator is an excellent choice for ensuring a high standard of care in your tank. It’s not as flashy as the number one product, but it has precise settings and is very reliable.

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