We spent many hours on research to finding aquarium co2, reading product features, product specifications for this guide. For those of you who wish to the best aquarium co2, you should not miss this article. aquarium co2 coming in a variety of types but also different price range. The following is the top 10 aquarium co2 by our suggestions:

Best aquarium co2

Product Features Editor's score Go to site
Seachem Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 500 ml Seachem Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 500 ml
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API Co2 Booster Freshwater Aquarium Plant Treatment 16 oz Bottle API Co2 Booster Freshwater Aquarium Plant Treatment 16 oz Bottle
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Aquarium CO2 Regulator with Solenoid 110V-Mini Dual Gauge Display Bubble Counter,Check Valve Fits Standard US Tanks-Accurate and Easy to Adjust (HP2000PSI,LP150PSI) Flow Meter Aquarium CO2 Regulator with Solenoid 110V-Mini Dual Gauge Display Bubble Counter,Check Valve Fits Standard US Tanks-Accurate and Easy to Adjust (HP2000PSI,LP150PSI) Flow Meter
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Fluval Mini Pressurized 20g-CO2 Kit - 0.7 ounces Fluval Mini Pressurized 20g-CO2 Kit - 0.7 ounces
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Fzone CO2 Regulator Aquarium Big Dual Gauge Display with Bubble Counter and Check Valve w/Solenoid 110V Fits Standard US Tanks Easy to Adjust CO2 Level Comes w/Tools Fzone CO2 Regulator Aquarium Big Dual Gauge Display with Bubble Counter and Check Valve w/Solenoid 110V Fits Standard US Tanks Easy to Adjust CO2 Level Comes w/Tools
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DIY Pressurized CO2 System --- Effective CO2 Generator Kit by SunGrow - Includes caps, valves, 3-way connector, tubing & pressure gauge - Creates a Healthy Underwater Habitat for Aquatic Pets & Plant DIY Pressurized CO2 System --- Effective CO2 Generator Kit by SunGrow - Includes caps, valves, 3-way connector, tubing & pressure gauge - Creates a Healthy Underwater Habitat for Aquatic Pets & Plant
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Rhinox Glass Drop Checker Kit  3 Seconds to Read CO2 Levels - 3 Minutes to Setup - Fastest Way to Ensure Sufficient Co2 in Planted Aquarium - Color Change Reflects the Level of CO2 Rhinox Glass Drop Checker Kit 3 Seconds to Read CO2 Levels - 3 Minutes to Setup - Fastest Way to Ensure Sufficient Co2 in Planted Aquarium - Color Change Reflects the Level of CO2
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Pollen Glass CO2 Diffuser with U-Shape Connecting Tube for Aquarium Planted Tank (20 - 50 US gallons) Pollen Glass CO2 Diffuser with U-Shape Connecting Tube for Aquarium Planted Tank (20 - 50 US gallons)
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DIY CO2 Aquarium Plant System DIY CO2 Aquarium Plant System
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DIY CO2 Generator Aquarium Plant System Kit D201 Tube Valve Guage Bottle Cap for Aquarium Moss Plant DIY CO2 Generator Aquarium Plant System Kit D201 Tube Valve Guage Bottle Cap for Aquarium Moss Plant
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1. Seachem Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 500 ml

Feature

Organic carbon for planted aquariums
Promotes the ferrous state of iron
Contains no phosphate or nitrate

Description

Flourish excel is a simple source of readily available organic carbon. All plants require a source of carbon. This is typically obtained from co2, but, may also be obtained via relatively simple organic compounds (such as photosynthetic intermediates). Since both processes occur simultaneously one can derive a substantial benefit with the use of flourish excel either alone or in conjunction with co2 injection. Flourish excel also has iron reducing properties which promote the ferrous state of iron (fe+2), which is more easily utilized by plants than ferric iron.

2. API Co2 Booster Freshwater Aquarium Plant Treatment 16 oz Bottle

Feature

Contains one (1) API CO2 BOOSTER Freshwater Aquarium Plant Treatment 16-Ounce Bottle
Promotes plant growth in freshwater aquariums
Adds essential carbon in a form plants can absorb from the water
Can be used alone or with a CO2 system without altering aquarium pH levels
Use daily in order to ensure lush, vibrant aquarium plants

Description

API CO2 BOOSTER Freshwater Aquarium Plant Treatment promotes vibrant, healthy aquarium plants with easy-to-use liquid carbon, which is a necessary element used by aquarium plants for photosynthesis. API CO2 BOOSTER Freshwater Aquarium Plant Treatment supplies a concentrated source of carbon in two forms: CO2, as well as simple, organic carbon compounds. This liquid treatment supplies simple carbon compounds and slowly releases CO2 that plants can absorb through the water. May be used alone or with a CO2 system. API CO2 BOOSTER Freshwater Aquarium Plant Treatment is safe for use with freshwater fish and will not alter pH levels in aquariums. Use with API LEAF ZONE and API ROOT TABS Plant Fertilizer for complete plant care. With API Aquarium products, its easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.

3. Aquarium CO2 Regulator with Solenoid 110V-Mini Dual Gauge Display Bubble Counter,Check Valve Fits Standard US Tanks-Accurate and Easy to Adjust (HP2000PSI,LP150PSI) Flow Meter

Feature

This aquarium CO2 regulator is built with high quality material, designed for long-lasting dependability and durability. Strong and durable material is specifically designed to deliver precision measured amounts of CO2 in pressures LP 150 PSI /HP 2000 PSI
The CO2 aquarium regulator is compatible with most of high density tubing to inject your aquarium with CO2 quickly and easily. It also works well with most CO2 atomizers and diffusers
The mini dual gauge display is easy to read your setting,the universal CGA320 inlet connection suits for most brands of carbon dioxide tank
Come with a tighten tool , a extra seal ring and a detailed instructions for use(not include tube and carbon dioxide tank)
The plant metabolic rate can be increased quickly,create the best growing conditions

Description

The aquarium CO2 regulator from DoubleSun is a helpfull assistant to create a water forest.It is compatible with most of high density tubing to inject your aquarium with CO2 quickly and easily. It also works well with most CO2 atomizers and diffusers.

The solenoid valve is energy-saving silence and low temperature.

The color and size is suitable that can harmony with the aquatic environment.Long outline let it more freedom.Strong and durable material is specifically designed for you.The plant metabolic rate can be increased quickly,create the best growing conditions.Specification

Gas service: CO2

Size: 4.5*4.5 inch

Color: luxury gold

Weight: 16.94 once

Outline length: 76 inch

Inlet gauge: 2000 PSI

Outlet gauge: 150 PSI

Max. inlet pressure: 1500 PSI

Max. outlet pressure: 45 PSI

Voltage: 110V

Inlet connection:CGA320

You will recieve a box that the size is 9.1*6.7*3.5 inch ,the weight is 24.36 once:

1. A piece of the finished aquarium CO2 regualator:



Bubble Counter:Flow-rate of CO2 gas indication device.

Check Valve:Prevent water flow back into the regulator.

Solenoid Valve:To control the on-off of CO2 supplication use with a timer to control it.

High Pressure Gauge:Show the pressure of cylinder,and check the volume of remaining CO2.

Low Pressure Gauge:Show the output pressure.

2. Detailed instructions for use:Give you some safety instructions.

3. Tighten tool:Install the aquarium CO2 regulator easily with wrench.

4. Extra seal ring:Better tightness and refused to air leakage.

WARNING: It still needs to take 3-5mins to release all of the gas remained in the regulator, when the solenoid valve is power off. OR you can release the gas quickly by control micro-adjustable valve.

4. Fluval Mini Pressurized 20g-CO2 Kit - 0.7 ounces

Feature

Mini Pressurized CO2 Kit for small, planted aquariums
Regulator valve effectively controls CO2 output
Bracket secures CO2 cartridge to the side of the aquarium
Kit includes: regulator valve, cartridge bracket, disposable CO2 cartridge, hose, and internal CO2 diffuser
Complete pressurized CO2 system

Description

The Fluval Mini Pressurized CO2 Kit is the ideal CO2 supplementation system for the Fluval Flora and other planted aquariums that are up to 15 gallons. It will ensure that the most important nutrients are available to plants to maintain vigorous, lush and vibrant growth and condition. The Fluval Mini Pressurized CO2 Kit is easy to use and will ensure your plants stay healthy and strong. The Kit comes with a regulator valve, cartridge bracket, disposable CO2 cartridge, hose, and an internal CO2 diffuser.

5. Fzone CO2 Regulator Aquarium Big Dual Gauge Display with Bubble Counter and Check Valve w/Solenoid 110V Fits Standard US Tanks Easy to Adjust CO2 Level Comes w/Tools

Feature

Suit for US Standard CO2 Bottle, CGA 320 interface ONLY, 110V AC Power, Rated Pressure 75psi
TOOLS INCLUDED! You Can Now Assist Your Aquatic Plants in Their Growth Cycle with Our CO2 Aquarium Regulator.Easy to Install.
Always Inject Just the Right Amount at The Right Time to Keep Your Plants Growing the Right Way.
The Precision Construction of This Regulator Will Ensure That You Can Always Fine Tune the Amount of CO2, Adjust It as Necessary, To Create the Best Growing Conditions for Your Aquarium Plants.
With 2 Big Dual Display Allows for Easy Reading of Your Settings to Ensure That They Are Always Where You Want Them to Be.

Description

Special designed for Aquarium Planted Tank

High precision tuning, easy to realize1 bubble per 3 seconds

The Precision Construction of This Regulator Will Ensure That You Can Always Fine Tune the Amount of CO2, Adjust It as Necessary, To Create the Best Growing Conditions for Your Aquarium Plants.

Package Include:
Big Display for bottle inner and outlet working pressurefor
Bubble counter with check valve function
Fine-tuning Valve easy for 1 bubble in 3 second.
With 110v Solenoid, fit with timer, can work auto

Inhibit green algae and promote plants growth
-Inhibit phytoplankton initial growth and reproduction.
-Activate micro elements to promote plants growth.
-Promotion of plants growth activates photosynthesis to stabilize ecosystem.

ATTENTION:
1.The maximum working pressure is design at 75psi(56Pa), if your cylinder inner pressure over this value, Solenoid valve will not open, will not working.
2. During the transportation, the core of the Solenoid valve may offset which will cause buzz sound, you can rapid turn on/off the power 5-10 times to fix the problem.
3. If you have fishes in your plant tank, DON'T add large doses suddenly, large dose CO2 will affect the PH of the water much, the fishes may be will not fit in.

6. DIY Pressurized CO2 System --- Effective CO2 Generator Kit by SunGrow - Includes caps, valves, 3-way connector, tubing & pressure gauge - Creates a Healthy Underwater Habitat for Aquatic Pets & Plant

Feature

INCLUDES EQUIPMENT NEEDED TO DO IT YOURSELF --- In order to build an effective and efficient pressurized CO2 system, there are a few pieces of equipment that are absolutely necessary. The SunGrow DIY CO2 Generator Set includes two caps (that perfectly fit common PET plastic bottles), needle valve, check valve, a pressure gauge, a 3-way connector and 6 feet of 6mm tubing. You simply have to use 2 carbonated beverage bottles, a reaction material and connect it to a diffuser.
GENERATES ESSENTIAL CO2 FOR A HEALTHY HABITAT --- Fish and aquatic pets release cO2 when they take in the dissolved oxygen from the aquarium water and plants absorb that co2. Carbon dioxide is essential to the photosynthesis process and sometimes fish alone do not generate enough Co2. A pressurized DIY CO2 system adds the needed gas to your water.
COST-EFFECTIVE & SAFE TO USE --- Instead of spending hundreds of dollars on expensive CO2 diffuser set-ups, save money by creating your own do-it-yourself CO2 generator. The basic principle behind the pressurized CO2 diffuser kit is to create a continuous supply of pure carbon dioxide by causing two different liquids to create with one another. The DIY solution is a cost-effective and satisfying way to add essential CO2 into your aquarium water.
EASY TO READ, SPECIALIZED PRESSURE GAUGE --- The SunGrow DIY CO2 Generator Set comes complete with a high-quality, specialized pressure gauge. The metal pressure gauge clearly shows the level of CO2 gas on a scale which indicates a safe area. An accurate CO2 reading gives you the chance to make adjustments or relieve pressure before there are any negative effects on your aquarium inhabitants.
CREATE HOMEMADE DRINKS AS AN ADDED BONUS --- Obviously the DIY Pressurized CO2 Kit is designed to add and control the amount of CO2 available to your fish and plants, but there is a bonus to creating your own CO2 generator. Instead of using baking soda or vinegar as your reaction material, use yeast and grape juice (or yeast and malted barley) to create homemade wine and beer.

Description

How do I set up the CO2 kit?
Start by labeling one bottle as "A" and other as "B". In Bottle A, add 200g citric acid (or 200ml of vinegar) to 600ml of water (1:3) and shake until well mixed. In Bottle B, add 200g baking soda to 800ml of water (1:4) and shake well. The reaction when these two liquids interact produces pure carbon dioxide.

Ensure that the needle valve is off before attaching the bottle caps. On Bottle A, screw on the cap attached to the pressure gauge via the decompression valve. On Bottle B, attach the cap that has a needle valve on the top and 3-way connector below. The needle valve connects to your aquarium CO2 diffuser using the included tubing. Next, open the needle valve and gently squeeze Bottle A to inject Bottle B with citric acid, thus generating carbon dioxide.

Close the needle valve to allow pressure to build up in the bottles. Shake Bottle B to activate the reaction. You will begin to see bubbles forming; if not, add more citric acid and shake again. When the barometer reaches 1 kgf/cm, the pressure is just right and you can open the needle valve to introduce CO2 into your tank.

Do I need to add CO2 to my aquarium water?
Different types of aquatic plants & pets require specific pH and CO2 levels to be at their healthiest and happiest. Varying amounts of CO2 in your aquarium water can cause swings in the pH level, especially during the night when plants do not photosynthesize. To properly monitor, maintain and adjust the CO2 level in your water, a complete CO2 system is recommended.

Are there any other benefits to a DIY CO2 kit?
Besides being beneficial to your aquatic plants and pets, the DIY CO2 generator kit has another added bonus: the ability to make your own homemade beverages. Replace the solution in Bottle A with grape juice, yeast and lemon juice for wine or use malted barley and yeast to produce beer. There is no byproduct waste and the process is much more interesting.

7. Rhinox Glass Drop Checker Kit 3 Seconds to Read CO2 Levels - 3 Minutes to Setup - Fastest Way to Ensure Sufficient Co2 in Planted Aquarium - Color Change Reflects the Level of CO2

Feature

HIGH-QUALITY, MUST-HAVE KIT - - - The Rhinox Glass Drop Checker is every aquarium/planted tank's essential tool. Keep the CO2 levels in your tank consistent by checking it regularly. This complete kit contains 1 glass drop checker, 1 suction cup, 1 10ml CO2 indicator solution, 1 2ml syringe and 1 colour chart. Please note: This kit does not come with the dKH Solution.
EASY TO USE - - - Make sure your test kit is clean. Drop 5 drops of CO2 indicator into the glass checker and make sure it is stored in the bulbous side of the valve with the opening facing down. Attach this to the side of your tank, completely submerged in the tank water and wait for up to 2 hours.
COLOUR CHANGE SHOWS RESULTS - - - Follow the color chart carefully. The CO2 indicator is blue in colour. When it turns green, that's the right balance of CO2. If it turns yellow, your tank has too much CO2. Make the necessary adjustments and test until you get green.
BENEFICIAL LEVEL OF CARBON DIOXIDE - - - A healthy tank has a carbon dioxide to water level that contains anywhere between 20 to 40 ppm (parts per million). 30 ppm is the optimal level that is healthy for both plants and fish. Keep CO2 levels optimum for all your aquatic plants to grow lush and beautiful.

Description

Keeping an aquarium is both an art and a science. Designing an aquascape and making sure it has all the elements it needs to stay alive and thriving is no easy task. One of the things owners have to look out for is to keep a right amount of CO2 in their tanks. CO2 or carbon dioxide is essential to a tank, it keeps plants happy and producing oxygen that's beneficial to your fishes.

One way to know if your aquarium has the right levels of CO2 is to test them with the Rhinox Glass Drop Checker. Made from high quality glass that's easy to see even in a busy tank, this comprehensive drop checker kit has everything you need to test for a healthy level of CO2.

Every kit comes with 1 glass drop checker, 1 suction cup, 1 10ml CO2 indicator solution, 1 2ml syringe and 1 colour chart. Simply add 5 drops of CO2 indicator into the glass checker and make sure it is stored in the bulbous side of the valve with the opening facing down. Attach this to the side of your tank with the suction cup, completely submerged in the tank water and wait for up to 2 hours. If the blue CO2 indicator turns green, that's the right balance of CO2. If it turns yellow, your tank has excessive CO2. Make the necessary adjustments, empty your glass valve and repeat the test until you get green. A healthy tank has a carbon dioxide to water level that contains anywhere between 20 to 40 ppm (parts per million). 30 ppm is the optimal level that is healthy for both plants and fish.

So the next time you are worried about your plants and fishes having too much or too little carbon dioxide in the tank, keep your hobby worry-free and enjoy your time as an aquarium owner with this easy-to-use Rhinox Glass Drop Checker Kit.

8. Pollen Glass CO2 Diffuser with U-Shape Connecting Tube for Aquarium Planted Tank (20 - 50 US gallons)

Feature

Efficient CO2 atomisation through ceramic membrane.
Improve the growth and health of your plants with sufficient CO2 supply.
1.5 inch diameter, designed for tanks between 30 to 50 us gallons.
U-shape connecting tube can avoid blockage of CO2 flow.
Package includes: 1x pollen CO2 diffuser, 1x glass u-shape tube, 2x suction cup.

Description

Diffusers, Excellent CO2 dissolve rate.
Compatible for aquarium live plants tank.

Compatible for pressurized Co2 tanks with at least 2 to 5 bubbles per second injection rate.
Not suitable for DIY yeast bottle.

Tips: All ceramic disc, tube, or surfaces MUST soaked in water for at least 30 minutes before use.
Always wet the glass tubing before inserting the silicon or rubber tubing to avoid damaging glasswares.

9. DIY CO2 Aquarium Plant System

Feature

Easy operations, great DIY enjoyment, perfect CO2 generator
Pressurized CO2 System Includes: Caps, needle valve, 3-way connector, check valve, tubing, pressure gage
Equipment Required: 2 x carbonated beverage bottles, reaction material and diffuser (need prepared by users)
Recommended Reaction Material: Baking soda+citric acid / alum+baking soda / acetic acid+baking soda, etc

Description

CO2 plays an indispensable role to the photosynthesis of aquatic plants, but the aquarium can not provide a genuine environment for plants' growing, so it comes even important for adding adequate amount of CO2 to the aquarium.

Example of Material Proportion (2L coke bottle, baking soda+citric acid):

Bottle A: 200g citric acid+600ml water (1:3)shake until well mixed
Bottle B: 200g baking soda+800ml water (1:4)shake until well mixed

Installations and Operations:

Turn off needle valve and connect to diffuser, check if any loose parts
Connect A, B parts with bottle A and B
Turn on the needle valve and adjust
Do not screw off the bottle cap directly for decompression or stopping reaction
Emergency Treatment: Turn off needle valve and disconnect the tube from the end for air out

Package Included:

1 x Pressure gage
2 x Bottle Cap
1 x control valve
Tubing (6mm outer diameter)

10. DIY CO2 Generator Aquarium Plant System Kit D201 Tube Valve Guage Bottle Cap for Aquarium Moss Plant

Feature

Working PrincipleAccording to the pressure principle,to push the acid liquid into the small soda liquid,the two liquids reacting to produce continuous PURE carbon dioxide.
MaterialThe CO2 DIY kit is with ABS engineering plastic cover, with locking pipe device to ensure non-deformation, non-loose, non-slip wire when working.And it's with professional metal material gas adjusting valve to ensure pure CO2 DIY.
AdvantageThis CO2 Generator System Kit is with Pressure gauge for pressure display,gas adjustable function,and simple pressure relief, easy to operate, safe and practical advantages! Once start, sustainable gas supply!
ApplicationEasy to operate and designed for low cost planted tank use,to provide your aquarium plants an abundant CO2 environment for better growing.
Package and ShippingPressurized CO2 system includes: caps, needle valve,3-way connector,pressure gauge, 2 bottle caps(not including the bottles),and tubes.Ship within US. Usually takes about 4-7 days.

Description

Description:
CO2 plays an indispensable role to the photosynthesis of aquatic plants, but the aquarium can not provide a genuine environment for plants' growing, so it comes even important for adding adequate amount of CO2 to the aquarium.Our Estink CO2 DIY kit is easy to operate and designed for low cost planted tank use,to provide your aquarium plants an abundant CO2 environment for better growing.

Specification:
Example of Material Proportion (2L coke bottle, baking soda+citric acid):
Bottle A: 200g citric acid+600ml water (1:3),shake until well mixed
Bottle B: 200g baking soda+800ml water (1:4),shake until well mixed

Installations and Operations:
Turn off needle valve and connect to diffuser, check if any loose parts
Connect A, B parts with bottle A and B
Turn on the needle valve and adjust
Do not screw off the bottle cap directly for decompression or stopping reaction
Emergency Treatment: Turn off needle valve and disconnect the tube from the end for air out.

Package includes:
1 x Pressure gauge
2 x Bottle Caps
1 x Needle Valve
Tubes (6mm outer diameter)

What do you need to prepare for this systems?
below(not included):
2x 2 Litre of Coka Cola plastic bottle
1x 200g of Citric acid or 200ml of vinegar
1x 200g of baking soda

Note:
1.The bottle must be carbonated beverage bottle, do not use pulpy, green tea, mineral water bottles, etc.
2.Trimming valve regulation avoid by sudden big or small, can't suddenly turn up, after immediately shut down again, so as not to cause abnormal pressure to the bottle.
3.Make sure carefully observe the direction of the parts before assembly. The usual wrong handle way will cause abnormal reaction.

Conclusion

By our suggestions above, we hope that you can found the best aquarium co2 for you. Please don't forget to share your experience by comment in this post. Thank you!
Kristi Kelly