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Aquarium CO2 Accessories

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  • Aquario Neo CO2 Extended Special Diffuser for aquarium CO2 systems, made of acrylic with a sleek, extended design
    Aquario Neo CO2 Extended Special Diffuser for aquarium CO2 systems, made of acrylic with fine diffusion features.
    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 gardening use, shown in the image.
    CLSMTC Ultum Nature Systems disposable CO2 cartridge for aquarium or beverage use, compact and easy to install.
    $ 15.99 - $ 64.99
    $ 15.99 - $ 64.99
    $ 15.99 - $ 64.99
    $ 15.99

    Ultum Nature Systems Disposable CO2 Cartridge

    The UNS Disposable CO₂ Cartridge is the easiest shortcut to a clean, mess‑free gas supply. It packs 95 g of pure CO₂ into a compact shell and swaps...

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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 gas sealing, shown in close-up with black rubber appearance and detailed texture.
    ASA CO2 Perma-Seal O-Ring made of durable rubber, designed for secure sealing in CO2 systems, shown in the image.
    $ 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 CO2 systems, made of acrylic, ensures efficient gas dispersion.
    Aquario Neo CO2 normal original diffuser for aquarium, made of acrylic, designed to evenly disperse CO2 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 %
  • Clear UNS Pro Airline Tubing by Ultum Nature Systems, flexible accessory for aquarium oxygen and air line setups.
    Clear UNS Pro Airline Tubing by Ultum Nature Systems, flexible and durable accessories for aquatic and aquarium setups.
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    $ 5.99 - $ 5.99
    $ 5.99
    $ 5.99 - $ 5.99
    $ 5.99

    UNS Pro Airline Tubing

    Standard plastic airline tubing gets stiff, brittle, and kinked over time (usually right behind the cabinet where you can’t see it), cutting off th...

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    $ 5.99 - $ 5.99
    $ 5.99
    $ 5.99 - $ 5.99
    $ 5.99
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  • UNS Pro CO2 Tubing for aquarium CO2 systems, flexible and durable plastic tubing for efficient gas transfer.
    UNS Pro CO2 tubing for aquarium CO2 systems, flexible clear tubing for reliable gas delivery in aquatic setups
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    $ 9.99 - $ 9.99
    $ 9.99
    $ 9.99 - $ 9.99
    $ 9.99

    UNS Pro CO2 Tubing

    Over time, standard soft hoses will balloon, leak gas through their walls, or pop straight off your equipment. The UNS Pro CO₂ Tubing is engineered...

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    $ 9.99 - $ 9.99
    $ 9.99
    $ 9.99 - $ 9.99
    $ 9.99
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  • UNSCO2 Micro CO2 Complete Kit with 7 pieces, including CO2 regulator, tubing, and accessories for aquarium use
    UNSCO2 Micro CO2 Complete Kit with 7 pieces, including CO2 regulator, hoses, and accessories for aquarium or beverage use.
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    $ 114.99 - $ 114.99
    $ 114.99
    $ 114.99 - $ 114.99
    $ 114.99

    UNS Micro CO2 Complete Kit - 7 Piece

    The UNS Micro CO₂ Complete Kit (7-Piece) solves everything by packing a professional-grade, space-saving carbon system into one single box. Built s...

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    $ 114.99 - $ 114.99
    $ 114.99
    $ 114.99 - $ 114.99
    $ 114.99
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  • UNSCO2 CO2 Cylinder Pro 5LB in metallic finish, designed for beverage and industrial use, with a smooth cylindrical shape.
    UNSCO2 CO2 Cylinder Pro 5LB metal tank with valve for beverage and industrial use, shown in a clear side view image.
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    $ 179.99 - $ 179.99
    $ 179.99
    $ 179.99 - $ 179.99
    $ 179.99

    UNS CO2 Cylinder Pro - 10LB

    The UNS CO₂ Cylinder Pro (10LB) is a heavy-duty, premium aluminum tank that supports thriving, high-tech planted aquariums. Built for serious aquas...

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    $ 179.99 - $ 179.99
    $ 179.99
    $ 179.99 - $ 179.99
    $ 179.99
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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)

    The UNS CO₂ Paintball Kit (24oz Cylinder) eliminates the guesswork by bundling a perfectly synchronized, premium carbon system into one simple pack...

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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, including regulator and accessories for paintball gameplay.
    UNSCO2 CO2 paintball kit with a 16oz cylinder for paintball guns, featuring a high-pressure CO2 tank and accessories.
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    $ 239.99 - $ 239.99
    $ 239.99
    $ 239.99 - $ 239.99
    $ 239.99

    UNS CO2 Paintball Kit (16oz Cylinder)

    The UNS CO₂ Paintball Kit (16oz Cylinder) eliminates the guesswork by bundling a perfectly synchronized, premium carbon system into one simple pack...

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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.

    When you are managing a beautiful nano aquarium or a compact desktop scape, finding space for bulk equipment can be a real challenge. The UNS CO₂ P...

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    $ 57.99 - $ 57.99
    $ 57.99
    $ 57.99 - $ 57.99
    $ 57.99
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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
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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.