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Aquarium CO2 Accessories

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  • 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
  • UNS Advanced CO2 Check Valve by UNSCO2, showing the metallic valve with inlet and outlet ports for controlling CO2 flow
    UNSCO2 CO2 advanced check valve, metallic with inlet and outlet ports, used in gas flow regulation systems
    $ 9.99 - $ 9.99
    $ 9.99
    $ 9.99 - $ 9.99
    $ 9.99

    UNS Advanced Check Valve

    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 - $ 9.99
    $ 9.99
    $ 9.99 - $ 9.99
    $ 9.99
  • Aquario Neo CO2 - DIY CO2 Kit CO2 - Buce Plant
    Aquario Neo CO2 refill for DIY CO2 kit, showing the refill bottle designed for aquarium CO2 systems.
    $ 11.99 - $ 11.99
    $ 11.99
    $ 11.99 - $ 11.99
    $ 11.99

    Aquario Neo CO2 Refill - DIY CO2 Kit

    Once your Aquario Neo DIY CO₂ Kit runs its course after 50 to 60 days and the underlying stabilizer gel is completely spent, you don't need to thro...

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    $ 11.99 - $ 11.99
    $ 11.99
    $ 11.99 - $ 11.99
    $ 11.99
  • Aquario Neo CO2 - DIY CO2 Kit CO2 - Buce Plant
    Aquario Neo CO2 - DIY CO2 Kit CO2 - Buce Plant
    $ 28.99 - $ 28.99
    $ 28.99
    $ 28.99 - $ 28.99
    $ 28.99

    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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    $ 28.99 - $ 28.99
    $ 28.99
    $ 28.99 - $ 28.99
    $ 28.99
  • Aquario Neo CO2 Extended Special Diffuser for aquarium CO2 systems, made of acrylic with a sleek design
    Aquario Neo CO2 Extended Special Diffuser showing acrylic build and intricate diffuser design for aquarium CO2 system.
    Save up to 37% Save %
    $ 24.49 - $ 28.49
    $ 24.49 - $ 28.49
    $ 24.49
    $ 15.99 - $ 17.99
    $ 15.99 - $ 17.99
    $ 15.99

    Aquario Neo CO2 Extended Special Diffuser

    If you are running a deeper rimless tank or a setup with serious vertical height, getting your gas all the way down to the substrate can mean runni...

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    $ 24.49 - $ 28.49
    $ 24.49 - $ 28.49
    $ 24.49
    $ 15.99 - $ 17.99
    $ 15.99 - $ 17.99
    $ 15.99
    Save up to 37% Save %
  • Qanvee CO2 inline atomizer for carbon dioxide inflation, compact and durable for bike tires and cycling applications.
    Qanvee CO2 Inline Atomizer for carbon dioxide inflating systems, featuring compact design and durable construction.
    $ 10.99 - $ 31.99
    $ 10.99 - $ 31.99
    $ 10.99 - $ 31.99
    $ 10.99

    Qanvee CO2 Inline Atomizer

    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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    $ 10.99 - $ 31.99
    $ 10.99 - $ 31.99
    $ 10.99 - $ 31.99
    $ 10.99
  • CLSMTC Ultum Nature Systems disposable CO2 cartridge for aquarium or beverage use, small cylindrical container with metal valve
    CLS™ Ultum Nature Systems disposable CO2 cartridge for aquarium or gardening use, compact metal cylinder with screw-on top.
    $ 15.99 - $ 64.99
    $ 15.99 - $ 64.99
    $ 15.99 - $ 64.99
    $ 15.99

    Ultum Nature Systems Disposable CO2 Cartridge

    Product Overview The UNS Disposable CO₂ Cartridge is the easiest shortcut to a clean, mess-free carbon dioxide supply for nano aquariums and deskto...

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    $ 15.99 - $ 64.99
    $ 15.99 - $ 64.99
    $ 15.99 - $ 64.99
    $ 15.99
  • ASA CO2 Perma-Seal O-Ring for secure CO2 tank connections, shown in close-up with black rubber material and sealing edges.
    ASA CO2 Perma-Seal O-Ring for secure CO2 tank connections, shown in close-up with black rubber material and sealing surface.
    $ 7.99 - $ 74.99
    $ 7.99 - $ 74.99
    $ 7.99 - $ 74.99
    $ 7.99

    CO2 Perma-Seal O-Ring

    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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    $ 7.99 - $ 74.99
    $ 7.99 - $ 74.99
    $ 7.99 - $ 74.99
    $ 7.99
  • Aquario Neo CO2 normal original diffuser for aquarium, made of acrylic, designed to disperse CO2 efficiently in aquatic tanks.
    Aquario Neo CO2 normal original diffuser for aquarium, made of acrylic, disperses CO2 efficiently in aquatic environments.
    Save up to 30% Save %
    $ 17.89 - $ 19.99
    $ 17.89 - $ 19.99
    $ 17.89
    $ 12.99 - $ 13.99
    $ 12.99 - $ 13.99
    $ 12.99

    Aquario Neo CO2 Normal Original Diffuser

    If you want tiny bubbles and big plant gains, the Aquario Neo CO₂ Normal Original makes it easy. Its micro‑pore ceramic disc vaporizes CO₂ into a s...

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    $ 17.89 - $ 19.99
    $ 17.89 - $ 19.99
    $ 17.89
    $ 12.99 - $ 13.99
    $ 12.99 - $ 13.99
    $ 12.99
    Save up to 30% Save %
  • UNSCO2 CO2 regulator solenoid replacement accessory with brass fittings and control components for precise gas regulation.
    UNSCO2 CO2 regulator solenoid replacement accessory with electronic valve for precise gas control and system maintenance.
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    $ 29.99 - $ 29.99
    $ 29.99
    $ 29.99 - $ 29.99
    $ 29.99

    CO2 Regulator - Solenoid Replacement

    Your regulator's electronic solenoid valve is the absolute heart of automated carbon dosing. Because aquarium plants only consume carbon dioxide wh...

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    $ 29.99 - $ 29.99
    $ 29.99
    $ 29.99 - $ 29.99
    $ 29.99
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  • UNS CO2 Cylinder Pro - 2.5LB CO2 - Buce Plant
    UNS CO2 Cylinder Pro - 2.5LB CO2 - Buce Plant
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    $ 239.99 - $ 239.99
    $ 239.99
    $ 239.99 - $ 239.99
    $ 239.99

    UNS CO2 Cylinder Pro - 20LB

    Product Overview The UNS CO₂ Cylinder Pro (20LB) is a heavy-duty, premium aluminum gas tank engineered to fuel thriving, high-tech planted aquarium...

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    $ 239.99 - $ 239.99
    $ 239.99
    $ 239.99 - $ 239.99
    $ 239.99
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  • UNSCO2 CO2 paintball kit with 24oz cylinder, including regulator and accessories for paintball guns.
    UNSCO2 CO2 paintball kit with a 24oz cylinder for paintball guns and air-powered equipment.
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    $ 226.99 - $ 226.99
    $ 226.99
    $ 226.99 - $ 226.99
    $ 226.99

    UNS CO2 Paintball Kit (24oz Cylinder)

    Product Overview The UNS CO₂ Paintball Kit (24oz Cylinder) eliminates the guesswork by bundling a perfectly synchronized, premium carbon system int...

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    $ 226.99 - $ 226.99
    $ 226.99
    $ 226.99 - $ 226.99
    $ 226.99
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  • UNSCO2 CO2 paintball kit with 16oz cylinder for paintball guns, includes regulator and accessories, designed for paintball gameplay.
    UNSCO2 CO2 Paintball Kit with 16oz cylinder, including regulator and accessories for paintball shooting games.
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    $ 239.99 - $ 239.99
    $ 239.99
    $ 239.99 - $ 239.99
    $ 239.99

    UNS CO2 Paintball Kit (16oz Cylinder)

    Product Overview The UNS CO₂ Paintball Kit (16oz Cylinder) eliminates the guesswork by bundling a perfectly synchronized, premium carbon system int...

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    $ 239.99 - $ 239.99
    $ 239.99
    $ 239.99 - $ 239.99
    $ 239.99
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  • UNSCO2 16 oz. CO2 paintball cylinder showing metal valve and cylindrical shape for paintball gun use.
    UNSCO2 16 oz. CO2 paintball cylinder showing a silver metal cylinder with valve and branding for paintball use.
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    $ 57.99 - $ 57.99
    $ 57.99
    $ 57.99 - $ 57.99
    $ 57.99

    UNS CO2 Paintball Cylinder - 16 Oz.

    Product Overview The UNS CO₂ Paintball Cylinder (16 Oz.) offers the perfect middle ground for hobbyists managing a beautiful nano aquarium or compa...

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    $ 57.99 - $ 57.99
    $ 57.99
    $ 57.99 - $ 57.99
    $ 57.99
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  • 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
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    $ 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
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    $ 0.00
    $ 9.99 - $ 12.59
    $ 9.99 - $ 12.59
    $ 9.99
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  • 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.
    Sold out
    $ 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.
    Sold out
    $ 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.