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Aquarium CO2 Accessories

  • Dymax CO2 Drop Checker device for monitoring aquarium CO2 levels, with clear glass and measurement scale.
    Dymax CO2 Drop Checker used in aquariums to monitor CO2 levels, featuring a clear plastic chamber with color indicator.
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    $ 15.99 - $ 20.99
    $ 15.99 - $ 20.99
    $ 15.99 - $ 20.99
    $ 15.99

    Dymax CO2 Drop Checker

    The Dymax CO2 Drop Checker is a great and essential option to monitor the CO2 levels in an aquarium. It is difficult to know how much CO2 is dissol...

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    $ 15.99 - $ 20.99
    $ 15.99 - $ 20.99
    $ 15.99 - $ 20.99
    $ 15.99
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  • Blue CO2 proof tubing by ZJLNM, flexible and durable for reliable carbon dioxide transfer in aquarium or brewing systems.
    Blue CO2 proof tubing by ZJLNM, flexible and durable for secure CO2 gas transfer in aquarium and industrial setups.
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    $ 0.00 - $ 13.99
    $ 0.00 - $ 13.99
    $ 0.00
    $ 9.99 - $ 12.59
    $ 9.99 - $ 12.59
    $ 9.99

    CO2 Proof Tubing - Blue

    This item qualifies for FREE shipping to the contiguous U.S. Shipping to Alaska or Hawaii? Contact us for a custom shipping quote—we’re here to hel...

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    $ 0.00 - $ 13.99
    $ 0.00 - $ 13.99
    $ 0.00
    $ 9.99 - $ 12.59
    $ 9.99 - $ 12.59
    $ 9.99
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  • UNS Mini Dual Stage CO2 Regulator for precise control of CO2 flow, featuring gauges and adjustment knobs.
    UNS Mini Dual Stage CO2 Regulator showing metal body, gauges, and control knobs for precise CO2 pressure regulation.
    $ 157.99 - $ 157.99
    $ 157.99
    $ 157.99 - $ 157.99
    $ 157.99

    UNS Mini Dual Stage CO2 Regulator

    Product Overview Your regulator is the real control center of your CO₂ system, designed to take 700+ PSI of cylinder pressure and tame it into a sa...

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    $ 157.99 - $ 157.99
    $ 157.99
    $ 157.99 - $ 157.99
    $ 157.99
  • UNS Pro Dual Stage CO2 Regulator with pressure gauges and control knobs for precise CO2 regulation in aquarium or beverage systems.
    UNS Pro Dual Stage CO2 Regulator for precise gas control, featuring pressure gauges and durable metal construction.
    $ 219.99 - $ 219.99
    $ 219.99
    $ 219.99 - $ 219.99
    $ 219.99

    UNS Pro Dual Stage CO2 Regulator

    Product Overview When managing high-tech layouts, large displays (20 gallons and above), or splitting gas across a multi-tank setup, you need the u...

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    $ 219.99 - $ 219.99
    $ 219.99
    $ 219.99 - $ 219.99
    $ 219.99
  • Acrylic Twinstar CO2 diffuser for aquarium tanks, showcasing the clear, compact device designed for efficient CO2 distribution.
    Acrylic Twinstar CO2 diffuser for aquarium, featuring a clear, compact design with fine bubble dispersion for efficient CO2 diffusion.
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    $ 12.99 - $ 14.99
    $ 12.99 - $ 14.99
    $ 12.99 - $ 14.99
    $ 12.99

    Twinstar CO2 Diffuser - Acrylic

    This item qualifies for FREE shipping to the contiguous U.S. Shipping to Alaska or Hawaii? Contact us for a custom shipping quote—we’re here to hel...

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    $ 12.99 - $ 14.99
    $ 12.99 - $ 14.99
    $ 12.99 - $ 14.99
    $ 12.99
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  • Dymax CO2 disposable cartridge holder accessory with a compact design for easy handling and secure attachment.
    Dymax CO2 disposable cartridge holder accessory for securing CO2 cartridges in welding or brewing equipment.
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    $ 5.99 - $ 5.99
    $ 5.99
    $ 5.99 - $ 5.99
    $ 5.99

    CO2 Disposable Cartridge Holder

    Miniature disposable gas systems are fantastic for nano layouts, but those tiny cartridges are notorious for being lightweight and top-heavy once y...

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    $ 5.99 - $ 5.99
    $ 5.99
    $ 5.99 - $ 5.99
    $ 5.99
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  • UNSCO2 CO2 J-Shape Pollen Glass Diffuser for aquarium aeration and CO2 diffusion, featuring a clear glass design.
    UNS CO2 J-Shape Pollen Glass Diffuser for CO2 systems, featuring a clear glass design and J-shaped structure.
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    $ 14.99 - $ 14.99
    $ 14.99
    $ 14.99 - $ 14.99
    $ 14.99

    UNS CO2 J-Shape Pollen Glass Diffuser

    The UNS CO₂ J-Shape Pollen Glass Diffuser merges premium artistic glasswork with high-performance atomization. Unlike standard straight-stem diffus...

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    $ 14.99 - $ 14.99
    $ 14.99
    $ 14.99 - $ 14.99
    $ 14.99
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  • UNSCO2 CO2 aquarium suction cups for secure attachment of CO2 systems to tank glass
    UNSCO2 CO2 aquarium suction cups for securing CO2 diffusers and equipment in fish tanks.
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    $ 8.99 - $ 18.99
    $ 8.99 - $ 18.99
    $ 8.99 - $ 18.99
    $ 8.99

    Aquarium Suction Cups

    Suction cups don’t get much attention, but they keep your whole setup from turning into chaos. Nothing’s worse than finding your CO₂ diffuser float...

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    $ 8.99 - $ 18.99
    $ 8.99 - $ 18.99
    $ 8.99 - $ 18.99
    $ 8.99
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  • Black CO2 proof tubing from ZJLNM, flexible and durable, designed for reliable CO2 transfer in aquarium or brewing systems.
    Black CO2 proof tubing from ZJLNM, flexible and durable for aquarium CO2 systems, shown coiled and ready for installation.
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    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99

    CO2 Proof Tubing - Black

    This item qualifies for FREE shipping to the contiguous U.S. Shipping to Alaska or Hawaii? Contact us for a custom shipping quote—we’re here to hel...

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    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99
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  • Clear CO2 proof tubing from ZJLNM, durable and flexible for reliable gas transfer in aquarium or industrial setups.
    Clear CO2 proof tubing from ZJLNM designed for reliable gas transfer in aquariums or hydroponic systems.
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    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99

    CO2 Proof Tubing - Clear

    This item qualifies for FREE shipping to the contiguous U.S. Shipping to Alaska or Hawaii? Contact us for a custom shipping quote—we’re here to hel...

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    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99 - $ 13.99
    $ 9.99
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Aquatic plants have two basic requirements: CO₂ and light. A proper CO₂ system is one of the most effective ways to support a thriving planted aquarium, especially if you want lush, vibrant plant growth.

Our premium aquarium CO₂ accessories help maintain stable carbon levels so plants can grow faster, stronger, and with richer color. When CO₂, light, and nutrients fall out of balance, algae can quickly take over; adding CO₂ gives plants the advantage, allowing them to out‑compete algae and develop the full, bushy growth every aquascaper wants.

CO₂ Resources & Setup Guides  

  1. Setting up a CO₂ system can seem intimidating at first, but the fundamentals are far easier than they appear. Begin with How to Add CO₂ to Your Planted Aquarium for a safe, step‑by‑step introduction.
  2. To ensure your system includes every critical component, review the 6 Essential Parts of a Planted CO₂ Setup before assembling your gear.
  3. If you want to understand why CO₂ has such a dramatic impact on plant health, The Mysteries of CO₂ in a Planted Tank Explained offers a clear, accessible breakdown of the underlying science.
  4. For a deeper dive into the equipment itself, our Guide to CO₂ Equipment Needed for a Planted Tank walks through each component and its role in a successful setup.