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Best Co2 Set Aquarium - Holiday Sale

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Last Updated - 15.12.2025

Best Choice

01

JBL

JBL PROFLORA CO2 Professional Set V, CO2 Fertiliser System Complete Set for 40-600 L, with Automatic CO2 and pH Control and Extensive Accessories, Without CO2 Bottle

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9.9

Exceptional

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

Professional set for optimal CO2 supply of aquarium plants in 40-600 l freshwater aquariums, healthy and strong plant growth
Easy installation by screwing the pressure regulator onto the bottle, connecting the hose to the bubble counter and reactor and finally starting the controller
Check valve to protect the bottle from water ingress, CO2 bottle and pH electrode not included
CO2/pH controller for measuring the pH value via a pH electrode (not included) and automatic control of the CO2 supply
Box contents: 1x JBL CO2 fertiliser complete set, JBL PROFLORA CO2 Professional Set V, including pressure regulator, 2 pressure gauges, solenoid valve, CO2 computer, hose, bubble counter check valve, reactor, fertiliser, item no. 6464200

331,44 €
02

Guemmer Products

Guemmer Products Complete CO2 System with Reusable Cylinder for Aquariums (Filled) Various Designs

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9.8

Exceptional

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

The CO2 diffuser made of glass dissolves up to 98% of the CO2 flowing through in the water and makes it available for your plants
Includes 2 m pressure-resistant Co2 resistant food-safe clear hose from USCAPE, specially designed for the high demands in aquarium for beginners to professionals
Ideal for beginners, professionals and aquascapers, including USCAPE test solution 20 mg/l (15 ml) and USCAPE endurance test
High-quality reusable carbon dioxide bottle with a capacity of 2 kg and prescribed transport protection collar (cage) for supplying aquatic plants in the aquarium with CO2 fertiliser
Co2 pressure regulator professional M1 with 2 pressure gauges and fine needle valve for precise adjustment of the CO2 quantity for the safety of your fish, shrimp or other pool inhabitants

209,95 €
Value for Money

03

JBL

JBL Proflora CO2 Advanced Organic Set, Organic CO2 Fertiliser Set for 40-110 L, with Extensive Accessories

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9.7

Exceptional

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

No CO2 pressure bottle required, works exclusively via a biological process
High yield, 2 x 40 days CO2 production thanks to immediate and long-term buffer system, organic components also available individually as a refill
Easy to install by mixing organic components and water in the reaction bottle and then connecting the hose to the backflow protection and the reactor
Box contents: 1 x JBL organic CO2 fertiliser system, JBL Proflora CO2 Advanced Organic Set, incl. reaction vessel, thermal protection, 2 x organic components, 3 m CO2 hose, suction holder, return protection, diffuser, item no. 6461200
Advanced set for CO2 supply of aquarium plants in 40-110 litres freshwater aquariums, healthy and strong plant growth, preventive against algae

34,99 €
04

Tetra

Tetra CO2 Optimate Complete Set for Enriching Aquarium Water with Carbon Dioxide for Magnificent Aquatic Plants with Diffusion Tube, Hose and Suction Cups

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9.6

Exceptional

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

Optimally growing plants also increase the oxygen content of the water - important for the well-being of the fish
Convenient enrichment of aquarium water with CO2
Consists of Tetra CO2 depot, diffusion tube with membrane and clamping ring, hose, suction cups, product information

15,19 €
05

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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9.5

Excellent

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

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

169,95 €
06

TROPICA

Tropica CO2 Set Fertiliser for Plants up to 200 Litres Aquariums Nano Basin

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9.2

Excellent

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

Co2 plant from Tropica up to 200l aquariums
Accurate and stable CO2 regulation.
A complete CO2 system in an elegant nano design.
3-i-1 diffuser that ensures optimum CO2 recovery.

70,99 €
07

JBL

JBL PROFLORA CO2 Basic Set M, CO2 Fertiliser System Complete Set for 40-300 L, with Reusable Bottle and Extensive Accessories

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9.0

Excellent

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

TÜV-tested CO2 bottle, hose fittings for added safety, check valve to protect the bottle from water ingress
Ready-to-connect complete set for CO2 supply of aquarium plants in 40-300 l freshwater aquariums, healthy and strong plant growth
Included CO2/Poh permanent test to display the CO2 contentration in aquarium water for readjustment if necessary
Easy installation by screwing the pressure regulator onto the bottle, then connecting the hose to the bubble counter and diffuser and adjusting the bubbles
Box contents: 1x JBL CO2 fertiliser complete set, JBL Proflora CO2 Basic Set M, incl. 500 g CO2 bottle, pressure regulator, hose, bubble counter check valve, diffuser, CO2 continuous test, fertiliser, item no. 6462000

156,00 €
08

Q Grow Innovative Aqua Tools

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

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8.9

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

Universal – suitable for aquariums from 20 to 1000 litres. 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 CO2 diffuser including 2 m CO2 hose, CO2 continuous test including 15 ml test fluid, pressure regulator including night shutdown, 425 g CO2 bottle, stand, disposable bottle adapter

169,95 €
09

Tetra

Tetra CO2 Plus Liquid Carbon Fertiliser for Magnificent Aquarium Plants 250ml Bottle

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8.7

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

Powerful plant growth is the best algae prevention.
Organic release of CO2 for up to one week.
Easy to use without additional tools.
Aquarium plants develop stronger and healthier.

5,89 €
10

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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8.4

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

Universal – ideal for use with many common 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 from the inside using a suction cup.
Colour display: the control fluid, which is filled into the glass container as an aquarium CO2 test, has a colour change that 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 Biotechnologie GmbH has been developing and producing high-quality products for aquariums, pond care, DIY supplies as well as accessories for dogs, cats and rodents for years - known for innovation and quality - made in Germany

12,49 €