Live Help Chat

CO2 (Carbon Dioxide) is useful both in freshwater and marine environments. 
In the freshwater aquarium, CO2 enhances your ability to successfully keep live aquatic plants.  As green plants photosynthesize, they utilize carbon dioxide. Without CO2, live aquarium plants will have a hard time thriving in the closed aquarium system.
In the marine aquarium, CO2 is used to lower the pH of calcium reactor effluent in order to dissolve hydrocarbonate media into bio-available calcium molecules. Calcium is then utilized by corals and other marine organisms mainly for skeleton building.

At AquaCave, we offer some of the best selection and best prices on CO2 accessories including CO2 regulators, CO2 Tanks, CO2 solenoid valves, pH controllers, CO2 reactors, CO2 diffusers and needle valves for your marine, reef, and freshwater aquarium.

13 of 13 Items
  • Deluxe Calcium Reactor Package

    AquaCave

    Deluxe Calcium Reactor Package

    Deluxe Calcium Reactor Package Turn your calcium reactor into a complete automated unit by adding our Deluxe CO2 Package.Can be used with any calcium reactor on the market. It includes everything you'll need to setup and automate your calcium dosing...

    Was: $506.53
    Now: $481.20
  • CarbonDoser Electronic CO2 Regulator V2

    CarbonDoser

    CarbonDoser Electronic CO2 Regulator V2

    CarbonDoser Electronic CO2 Regulator V2 The new V2.0 allows for the aquarist to position the CO2 cylinder out of the way in a remote area. Then mounting the "box" anywhere such as up on a board with all the electronics/pH controllers/ETC The 1/8"...

    $449.99
  • Milwaukee MC122 pH Controller Milwaukee MC122 pH Controller Milwaukee MC122 pH Controller Milwaukee MC122 pH Controller Milwaukee MC122 pH Controller

    Milwaukee Instruments

    Milwaukee MC122 pH Controller

    Milwaukee MC122 pH Controller. ACCURATE. SIMPLE. RELIABLE. 24/7 PH CONTROL. The Milwaukee MC122 PRO pH controller lets you measure and adjust pH levels automatically. WHAT PEOPLE ARE SAYING "I run this unit 24/7 and have not had any problems for the...

    $208.15
  • CO2 Turbo Diffuser 400 CO2 Turbo Diffuser 400 CO2 Turbo Diffuser 400 CO2 Turbo Diffuser 400

    Mr. Aqua

    CO2 Turbo Diffuser 400

    CO2 Turbo Diffuser 400 Mr. Aqua’s CO2 Turbo Diffuser has a patented power scatter design that provides a fast, effective way to diffuse carbon dioxide into the water for plants. The powerhead driven atomizer and patented multilayer compression...

    $54.99
  • 4 Way Co2 Manifold 4 Way Co2 Manifold

    AquaCave

    4 Way Co2 Manifold

     4 Way Co2 Manifold Description: Made from high grade aluminum alloy and stainless steel, the solid constructions ensure long-lasting durability and dependability.With this splitter, you can easily connect up to three or two CO2 diffusers/supplies...

    $49.95
  • Replacement CO2 Cartridges, 3 PACK for Pierce CO2 System

    Azoo

    Replacement CO2 Cartridges, 3 PACK for Pierce CO2 System

    Replacement CO2 Cartridges,3 PACK, for Pierce CO2 System. For larger planted aquariums we recomend aquiring the multi pack replacement cartridges for the multi pack allows for having extra bottles on hand to prevent running out and creating ph swings as...

    $39.95
  • CarbonDoser CO2 Precision Check Valve CarbonDoser CO2 Precision Check Valve CarbonDoser CO2 Precision Check Valve CarbonDoser CO2 Precision Check Valve

    CarbonDoser

    CarbonDoser CO2 Precision Check Valve

    CarbonDoser® Precision Check Valve "Corrosion Resistant" (4 psi CRP) After years of experience with CO2 systems, we discovered why consistent "bubble counts" are, most of the time, impossible. Here's why: ALL checkvalves, even...

    $29.99
  • Co2 Needle Valve - NV-1 Co2 Needle Valve - NV-1 Co2 Needle Valve - NV-1

    AquaCave

    Co2 Needle Valve - NV-1

    Co2 Needle Valve - NV-1 Brand New & High Quality. Precise structure, durable stainless steel inner part with aluminum alloy to release CO2 by fine tuning. Special metal-grinded surface, light weight, easy to operate. Ergonomically design, easy...

    $17.95
  • CO2 Glass Diffuser, MA-002

    Azoo

    CO2 Glass Diffuser, MA-002

    CO2 Glass Diffuser, MA-002Specifications:- Use to count Co2 bubble dispense in planted aquarium- Compact design, durable construction.- 2 suction cups included- Can be cleaned.Instructions:When installing pressure pipes from the CO2 regulator, the pipe...

    $11.95
  • CO2 Check Valve, Stainless Steel, IA-962

    Azoo

    CO2 Check Valve, Stainless Steel, IA-962

    CO2 Check Valve, Stainless Steel, IA-962. The check valve is usually placed between the CO2 regulator and the bubble to prevent water from back-flowing to the regulator.Fits standard 1/4" OD tubing.CO2 Check Valve, Stainless Steel, IA-962. The check...

    $9.95
  • Bubble Counter Liquid 50ml.

    Bubble Counter Liquid 50ml.

    Bubble Counter Liquid 50ml. Special high viscosity liquid to prevent evaporation and spillage in Bubble Counter. To be used externally only and comes in 50 mL spout cap for easy & direct application.  Imported from Germany.Bubble Counter...

    $7.95
13 of 13 Items