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Aquarium CO2 Accessories

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  • Aquario Neo CO2 Extended Tiny Diffuser for aquarium, made of acrylic, disperses CO2 efficiently in aquatic environments.
    Aquario Neo CO2 Extended Tiny Diffuser in clear acrylic for aquarium CO2 distribution.
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    $ 22.99
    $ 22.99 - $ 22.99
    $ 22.99
    $ 16.99
    $ 16.99 - $ 16.99
    $ 16.99

    Aquario Neo CO2 Extended Diffuser - Tiny

    If you are running a deep micro-tank or an ultra-compact rimless nano setup, finding equipment that fits without causing a massive visual distracti...

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    $ 22.99
    $ 22.99 - $ 22.99
    $ 22.99
    $ 16.99
    $ 16.99 - $ 16.99
    $ 16.99
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  • Dymax CO2 Drop Checker used for monitoring CO2 levels in aquarium tanks, featuring a clear, color-changing indicator.
    Dymax CO2 Drop Checker for aquarium, showing transparent device used to monitor CO2 levels in aquatic tanks.
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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 Pro Dual Stage CO2 Regulator with gauges and control knobs for precise gas pressure regulation in aquarium or beverage setups.
    UNS Pro Dual Stage CO2 Regulator for precision control, featuring gauges and brass construction, used for CO2 tank regulation.
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    $ 219.99 - $ 219.99
    $ 219.99
    $ 219.99 - $ 219.99
    $ 219.99

    UNS Pro Dual Stage CO2 Regulator

    **This item qualifies for free shipping** When managing high-tech layouts, large displays (20 gallons and above), or splitting gas across a multi-t...

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    $ 219.99 - $ 219.99
    $ 219.99
    $ 219.99 - $ 219.99
    $ 219.99
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  • Aquario Neo CO2 DIY kit for aquarium plants, featuring CO2 regulator, diffuser, and tubing for easy setup.
    Aquario Neo CO2 DIY kit for aquarium CO2 injection, includes regulator and tubing, designed for easy CO2 setup.
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    $ 21.99 - $ 21.99
    $ 21.99
    $ 21.99 - $ 21.99
    $ 21.99

    Aquario Neo CO2 - DIY CO2 Kit

    If you have been wanting to try your hand at high-tech plants but feel completely intimidated by massive gas cylinders, heavy regulators, and confu...

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    $ 21.99 - $ 21.99
    $ 21.99
    $ 21.99 - $ 21.99
    $ 21.99
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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 fish 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
    Sold out

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.