Recommended products in the "CO2 for Aquarium" section
We have products in the range "CO2 for aquarium" compared with each other and put together recommendations for you. Here you will find the top 15 in the “CO2 for aquarium” section.
CO2 for aquariums – the most important things at a glance
CO2 is essential for the health of plants in aquariums as it promotes their photosynthesis. A basic distinction is made between two products: CO2 bottles and bio-CO2 sets. CO2 cylinders provide a controlled and constant supply of carbon dioxide, but are more expensive to purchase and maintain and require technical understanding to set up. Bio-CO2 sets are easier to use and produce CO2 through the natural fermentation of yeast and sugar, however the amount of CO2 produced is less controllable and the set needs to be refilled regularly. In general, you should be careful with the dosage, as too much CO2 can be harmful to fish. Ultimately, the choice of product should be tailored to the individual needs of the aquarium, your own level of knowledge and your budget.
The bestsellers in the field of "CO2 for aquariums"
A list of the best sellers under the category "CO2 for aquarium" you can find here. Here you can find out which products other users have bought particularly often.
ServicesBestseller no. 1 
Tetra CO2 Plus liquid carbon fertilizer for magnificent aquarium plants, 250 ml bottle
- Biological release of CO2 up to a week
- Aquarium plants develop stronger and healthier
- Simple application without additional tools
- Vigorous plant growth is the best way to prevent algae
5,89 EUR 
View product Bestseller no. 2 
sera CO2-Start - For getting started with CO2 fertilization
- for co2 supply for aquariums from 60 to 120 liters
- addition of co2 through co2 tablets
- practical and uncomplicated co2 fertilizer system
- the co2 tabs are simply placed in the shaft of the co2 diffusion reactor
- each tablet then releases approx. 100 ml (equivalent to 2500 counting bubbles) of co2 when it comes into contact with aquarium water
- sera co2 start
- plant care accessories
- aquaristic
- fish food
- ornamental fish food; Which components are included in the scope of delivery of the product: a sera CO2 starter set
- sera Co2 start
- Plant care accessories
- Aquaristics
- fish food
- Ornamental fish food
Bestseller no. 3 
QWORK® Aquarium CO2 pressure reducer, dual-gauge display, with bubble counter and check valve system (W21.8 interface)
- CO2 pressure controller with two gauges to monitor the operating status of the CO2 system in real time; Suit for W21.8 interface, 12V DC.
- Note: Please connect the solenoid valve to the power supply before connecting it to the CO2 bottle, otherwise the solenoid valve will be damaged.
- With fine-tuning valve to precisely adjust the CO2 flow; Bubble counter with check valve function, stops water backflow.
- Made of hard aluminum alloy, the surface with spray treatment. The bubble counter and fine adjustment knob are knurled for greater friction.
- Reliable after-sales support including full refund for quality issues and responsive customer service within 24 hours.
42,99 EUR
View product Bestseller no. 4 
NICREW Aquarium CO2 Regulator Aquarium Pressure Reducer Double Pressure Gauge with Solenoid Valve Bubble Counter Interface W21,8
- Suitable for use with returnable and disposable CO2 bottles (German standard connection W 21,8 x 1/14")
- The two manometers show the cylinder pressure as well as the working pressure and easily read your settings
- The integrated fine needle valve allows the CO2 supply for your aquarium to be regulated very precisely
- The high-quality bubble counter allows you to regulate according to the number of bubbles per minute that is usual in aquaristics, in order to create the best growth conditions for your aquarium plants
- For use with CO2 cylinders with internal thread TR21-4, you can find the cylinder adapter on amazon.de under the search term "B091XMWR3W"
49,99 EUR
View product Bestseller no. 5 
MICROBE-LIFT Bio-CO2-473 ml - Innovative liquid CO2 fertilizer. Promotes plant growth in freshwater aquariums with microbes & humic acid, free of nitrates.
- BIO-CO2: A specially developed microbial source of carbon from beneficial bacteria and humic acid for simple and effective CO2 fertilization of aquarium plants in any freshwater aquarium. It is ideal for combining with the MICROBE-LIFT fertilizer series.
- HOW IT WORKS: The useful bacteria contained produce CO2 available for plants from the humic acid also contained in a biological process.
- GROWTH & COLORS: Bio-CO2 promotes healthy plant growth and intensifies the colors by optimizing the nutrient uptake in plants.
- APPLICATION: Starting dosage: Add 10 ml BIO-CO2 to 100 liters of water on the first day. Subsequent dosage: Add 1 ml to 2 liters of water every 2-100 days. Note: The dosage depends on the number of plants, density and size and can be slowly increased depending on plant growth.
- MICROBE-LIFT- Is one of the world's leading brands in the care and supply of seawater and freshwater aquariums and ponds. The products are among the most popular and effective on the market. All products are subject to very strict control and quality management to ensure consistently high quality.
12,90 EUR
View product Bestseller no. 6 
JBL PROFLORA CO2 Cylinder 500 U 3X 500 g CO2 disposable storage bottle (pack of 3)
- CO2 storage bottles for all CO2 systems. Supply aquarium plants with their main nutrient carbon dioxide (CO2) and thus prevent algae
- Simple installation: Screw the pressure control fitting with the internal thread onto the external thread (M10x1) of the storage bottle
- Including fitted rubber foot for a secure footing. Total height with fitted pressure reducer: 37 cm
- TÜV tested. Since CO2 liquefies under pressure, CO2 pressurized gas cylinders must be in a vertical position during operation
- Scope of delivery: 3x disposable bottles, already filled with 500 g CO2 each, dimensions: 31 x 7,5 cm, thread M10x1
- Age Range Description: Adult
Bestseller no. 7 
Tetra CO2-Optimat - complete set for enriching the aquarium water with carbon dioxide for magnificent aquatic plants, with diffusion tube, hose and suction cups
- Convenient enrichment of the aquarium water with CO2
- Optimally growing plants also increase the oxygen content of the water - important for the well-being of the fish
- Consisting of Tetra CO2 depot, diffusion tube with membrane and clamping ring, hose, suction cups, product information
16,49 EUR
View product Bestseller no. 8 
Tropica CO2 set system - fertilization for plants up to 200l aquarium nano tank
- Co2 system from Tropica up to 200l aquariums
- A complete CO2 system in an elegant nano design.
- Accurate and stable CO2 regulation.
- 3-i-1 diffuser that ensures optimal CO2 utilization.
Bestseller no. 9 
Measury CO2 long-term test aquarium 'Orb' with 30 ml test liquid 20 mg/l, CO2 test aquarium drop checker, CO2 tester
- CO2 measurement in the aquarium: By changing the color of the test liquid, which is filled in the endurance test, the CO2 content in the aquarium can be determined. If the CO2 content in the aquarium is 20mg / l, the solution turns green
- Including 30 ml test liquid: The 20 mg/l test liquid is sufficient for at least 12 months. Note: Unfortunately, the test does not work with liquid CO2 fertilizer
- Extra strong suction cup: Thanks to the extra strong suction cup, the endurance test holds firmly to the pane
- High-quality borosilicate glass: Clear, perfectly shaped borosilicate glass, as it is also used in laboratory equipment, makes the long-term test a real eye-catcher
- Scope of delivery: 1 x CO2 long-term test glassware, 1 x 30 ml indicator liquid 20mg / l, 1 x suction cup, 1 x German-language instructions
19,95 EUR
View product Bestseller no. 10 
Measury CO2 long-term test aquarium with 30 ml test liquid 20 mg/l, CO2 test aquarium drop checker, CO2 tester
- CO2 measurement in the aquarium: By changing the color of the test liquid, which is filled in the endurance test, the CO2 content in the aquarium can be determined. If the CO2 content in the aquarium is 20mg / l, the solution turns green
- Including 30 ml test liquid: The 20 mg/l test liquid is sufficient for at least 12 months. Note: Unfortunately, the test does not work with liquid CO2 fertilizer
- Extra strong suction cup: Thanks to the extra strong suction cup, the endurance test holds firmly to the pane
- High-quality borosilicate glass: Clear, perfectly shaped borosilicate glass, as it is also used in laboratory equipment, makes the long-term test a real eye-catcher
- Scope of delivery: CO2 long-term test glass, 30 ml indicator liquid 20 mg/l, suction cup, operating instructions
19,95 EUR
View productThis is what Stiftung Warentest says about products in the “CO2 for Aquarium” area
Stiftung Warentest examines, compares and tests the best products for consumers. Many of the tests by Stiftung Warentest help in deciding which product to buy. We do not currently know whether there is a test winner from Stiftung Warentest for this product that is recommended for purchase.
Our comparison winner in the field of "CO2 for aquarium"
ServicesCompare winner
Tetra CO2 Plus liquid carbon fertilizer for magnificent aquarium plants, 250 ml bottle
- Biological release of CO2 up to a week
- Aquarium plants develop stronger and healthier
- Simple application without additional tools
- Vigorous plant growth is the best way to prevent algae
5,89 EUR
View productCurrent offers in the field of “CO2 for aquariums”
You want the best products in the range "CO2 for aquarium" buy? In this bestseller list you will find new offers every day. Here you will find a large selection of current products in the "CO2 for aquarium" category.
ServicesBestseller no. 1
ServicesBestseller no. 2