10 Best diy co2 aquarium in Deutschland

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Last Updated - 28/04/2025

Best Choice

01

Q Grow Innovative Aqua Tools

Q-Grow CO2 System Aquarium Complete Set Including CO2 Cylinder - Simple and Universal - Includes Stainless Steel Diffuser, Continuous Test, Pressure Regulator, 425 g CO2 Bottle, up to 1000 L

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9.9

Exceptional

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Universal – suitable for aquariums from 20 to 1000 litres with and without cover. Thanks to the easy installation and handling, the CO2 complete set is also ideal for beginners.
Flexible – thanks to the included adapter, the pressure regulator can be used for both disposable and reusable CO2 bottles, which offers maximum flexibility in the CO2 supply of the aquarium.
Easy replacement of the CO2 bottle – the 425 g CO2 bottle can be used in numerous super- and DIY stores (Rewe, Aldi, Lidl, DM, Rossmann, Edeka and much more.) easily and cost-effectively.
Easy CO2 supply: complete set with precise CO2 supply, variable CO2 diffuser for any aquarium size and CO2 continuous test. Contains everything for an optimal CO2 supply of your aquarium.
CO2 complete set for aquarium: includes variable Q-Grow CO2 diffuser including 2 m CO2 hose, Q-Grow CO2 continuous test including 15 ml test liquid, Q-Grow pressure regulator including night shutdown, 425 g CO2 bottle, Q-Grow stand, Q-Grow disposable bottle adapter

159,95 €
02

FZONE

FZONE 4L CO2 System Aquarium CO2 Generator System Carbon Dioxide Reactor Kit with Regulator and Needle Valve for Aquarium Plants Tanks

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9.6

Exceptional

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Safe. The bottle body is made of 1.5mm thick SUS304 stainless steel (25% thicker than normal 1.2mm bottles). It can withstand a pressure of up to 80 kg/cm2 (or 1137 PSI). The safety valve opens automatically when the internal pressure exceeds the safety threshold
Professional DIY kit. A complete system in a 4L bottle that includes a SUS304 stainless steel bottle, a regulator, a precision needle valve and an easily adjustable bubble counter
Please note: The required powders to generate CO2 gas are not included. You need citric acid and sodium bicarbonate powder
Needle valve with bubble counter. The high-precision, aquarium-specific needle valve ensures accurate fine tuning. Steady 1 bps is achievable. Bubble counter with built-in check valve. It prevents water from flowing back into your CO2 tank (protects your CO2 tanks from rust and corrosion)
12 V DC instead of alternating current. When the magnet is on a timer, you can specify when and for how long the CO2 injection should be turned on

139,99 €
03

FZONE

FZONE CO2 Pressure Regulator Aquarium Co2 Regulator DC Magnet with Large Dual Gauge Display as well as Bubble Counter and Check Valve System Grow DIY CO2 System w21.8 - Side Open Cylinder

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9.4

Excellent

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Main highlights

Updated split-type DC brine gap. Latest 12 DC split type solenoid instead of AC models, safer and more stable.
ONE YEAR WARRANTY Fzone offers a one-year warranty, 24/7 service and you can contact us at any time with any questions about our products.
HIGH PRECISION STRUCTURE CO2 pressure regulator is designed for aquarium. High precision fine tuning easy for CO2 to 1 bubble in 3 seconds. Improved sealing material prevents leakage.
Double large gauge. 1.6 inch double gauge, easy to read your cylinder internal and working pressure.
Class 1 manufacturing technology CO2 pressure regulator made of hard aluminium alloy, surface with spray treatment. Push button and fine adjustment knob with knurling.
Bubble counter and tool included. CO2 pressure regulator Together with the bubble counter, you can read your CO2 flow rate. Bubble counter with check valve function, stop water backflow to bottle. All installation tools included, make everything easy.

48,99 €
04

ACAGALA

ACAGALA Aquarium DIY CO2 Generator System Kit CO2 Generator System with Solenoid Valve Bubble Diffuser Carbon Dioxide Reactor Kit for Plants Aquarium

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9.3

Excellent

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Main highlights

The safety valve supports manual pressure relief. If the pressure is below 4 kg, it can be relieved manually by pulling the ring of the safety valve. It is very safe.
Solenoid valve: turn on and off the CO2 generator system with a timer (not included). Bubble counter with check valve: flow rate of the CO2 gas indicator and prevent the backflow of water into the bottle.
Made of aluminium alloy. It is strong, durable and efficient. Well sealed caps and tubes, leak-proof, not deformed, never loose. Professional pressure gauge for pressure monitoring. Cheap, easy to constantly produce pure CO2 through chemical reactions.
Equipped with a safety valve, the pressure greater than 4 kg pressure is automatically relieved, the pressure of the carbonated drink bottle is 8 kg, safety is guaranteed.
Comes with a bubble diffuser, refine the bubbles and make it easy to dissolve in water and be absorbed by plants. Inject CO2 into your aquarium quickly and easily.

36,69 €
Value for Money

05

CENPEK

CENPEK DC CO2 Solenoid Valve Aquarium CO2 System Regulator Solenoid Valve for Aquarium Aquarium Water Plant Grass Growing

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9.2

Excellent

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Main highlights

Nut locking design for CO2 pipe connection, anti-shedding and good sealing. No leaks.
It can be used for DIY CO2 systems and can also be used in CO2 tank systems.
Fits 6mm pipe (inner diameter 4mm and outer diameter 6mm)
Do not connect this solenoid directly to the high pressure CO2 tank. It should be installed according to the regulator or used on DIY CO2 system. Operating pressure less than 120 psi.
12V DC powder input, safer than AC input. No buzzing noise (AC model may have buzzing noise when used for a long time). Lower power consumption, lower low temperature, no heating.

16,99 €
06

ARKA

ARKA mySCAPE-CO2 Checker - Includes 15 ml Indicator Solution - CO2 Continuous Test with Colour Display for Precise Monitoring in Freshwater Aquariums, Essential for Aquascaping

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8.9

Very Good

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Universal: ideal for use with many standard CO2 supply systems, such as the ARKA mySCAPE-CO2 system.
Easy to place: the CO2 test glass container can be easily attached to the aquarium disc by means of a suction cup from the inside.
Colour display: the control fluid, which is filled into the glass container acting as an aquarium CO2 test, has a colour change, which shows the status of the CO2 supply in the aquarium at any time and can therefore be used as a reliable aquarium CO2 continuous test.
ARKA mySCAPE CO2 CHECKER SET: A CO2 tester made of glass and 15 ml CO2 indicator liquid, ideal for permanent and easy monitoring of the CO2 supply in any freshwater aquarium.
ARKA Biotechnology GmbH - deals with the development, production and worldwide distribution of innovative products from aquariums, DIY supplies, to accessories for dogs, cats and rodents.

14,90 €
07

WEAVERBIRD

WEAVERBIRD Aquarium CO2 Diffuser U Bend U-shaped Glass Tube Bend Accessories DIY for Aquarium CO2 Oxygen Tubes Gift for Pets

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8.8

Very Good

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STURDY AND DURABLE:U-shaped tube made of high quality glass, crystal clear, durable and beautiful.
SENSITIVE DESIGN The CO2 diffuser has high transparency. The fine transparent glass blends into the environment of the aquarium, creating a sense of harmony and unity. Suitable for aquariums, aquariums, especially aquatic plants, tropical fish for observing and cultivating for aquariums.
PACKAGING & AFTER-SALES SERVICE U tubes are packed in bubble bags to avoid damage However, if you have any problems with your aquarium CO2 diffuser, please send us an email immediately. We will answer your message within 24 hours
Internal dimensions: 15 mm (0.59 inches); Total dimensions: 4 x 45 mm (0.15 x 1.77 inches) L x Max D, simply connect the air line for aquarium. Connect the air line with 4 mm inner diameter (6 mm outer diameter).
Function: This CO2 diffuser can produce rich CO2 to provide aquarium plants with the carbon dioxide they need, ensuring nutrition and health. The CO2 diffuser provides aquarium plants a friendly living environment.

6,99 €
08

FZONE

FZONE 24 mm CO2 Diffuser, Works with All CO2 Systems, Litre, Tailored Ceramic, Porous Membrane, Finest CO2 Bubbles, Ultra Clear Acrylic Glass, Made in South Korea (L-24 mm)

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8.7

Very Good

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Main highlights

With the included suction cup, the user can safely place it in the corner of the planted aquarium.
The elegant and sturdy ceramic disc is microporous and is permanently glued to an acrylic bubble counter to hold under high pressure and create a superfine Co2 mist. The ceramic disc is made of high quality transparent acrylic and is not easy to break during the maintenance of the aquarium.
The custom-made ceramic from South Korea used in the Fzone NEO diffuser has microscopic holes, resulting in a very fine and thorough air bubble diffusion. It ensures a high level of CO2 saturation in your aquarium. The fine Co2 mist easily breaks down in the water column and is absorbed by the aquatic plants.
Only 20 PSI (1.37 bar) required, it works with all CO2 systems, also DIY steps. Recommended pressure higher than 25PSI.
3 models for different pool sizes. S for 1-2 bps (bubbles per second), for 13 gal or less. M for 2-3 bps (bubbles per second), for 13-32 gal. L for >3 bps (bubbles per second), for 32 gallons or more

16,99 €
09

DONGKER

DONGKER CO2 Solenoid Valve, DC 12 V Aquarium CO2 Regulator, Electric Solenoid Valve, CO2 System Regulator for Aquariums, Water Plants, Grass Growing

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8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Premium Material The main body is made of aluminum alloy with hard oxidation on the surface, durable, corrosion resistant and has a long service life. The high-quality sealing ring has good sealing performance.
Note: Do not connect this solenoid directly to the high pressure CO2 tank. It should be installed according to the regulator or used in a DIY CO2 system. You can detect that it will automatically turn on and off when used with a timer.
Function:Keeping your aquatic plants healthy doesn't have to cost a fortune thanks to this CO2 solenoid valve that is wired to your aquarium's lighting system and interrupts CO2 supply at night when your plants don't need it.
Dimension: single head solenoid valve, one end is connected with 4mm inner diameter, 6mm outer diameter gas line, the other end is connected to M10x1 male thread or fine tuning valve, bubble counter.
Built-in solenoid valve coil, waterproof, 12V DC input voltage, energy saving and low temperature; Stable performance; Easy installation; Integrated solenoid valve coil; Safe, waterproof, low pressure, low temperature; External mini CO2 solenoid valve low temperature CO2 DIY generator, stable performance, easy to use, easy to install

23,99 €
10

Ausla

U-shaped CO2 Diffuser, DIY 4 in 1 Co2 Diffuser for DIY Co2 System, Check Valve, Bubble Counter, Planted Aquarium

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8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

【Warranty】: 100% refund or resend if you have any problems
【Multifunctional】: These CO2 atomizers have a built-in multi-function system, including check valve, bubble counter, ultra micropore atomization and U-shaped air inlet. Suction cup is also included for mounting.
【Low cost】: this CO2 system is designed for economical use in planted tanks
【Easy to install】This diffuser is easy to attach. A suction cup for mounting is also included
【4 in 1 CO2 Diffuser】: It is a 4 in 1 high performance CO2 diffuser for DIY CO2 systems (1-2 bar) and compressed CO2 for up to 300L aquarium

17,14 €