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Aquarium CO2 Accessories

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  • Aquario Neo U-Clips accessory with clear plastic U-shaped clips for aquarium setup and maintenance.
    Aquario Neo U-Clips accessories in black, designed for secure cable or pipe management, with a U-shaped clip design.
    $ 6.99 - $ 6.99
    $ 6.99
    $ 6.99 - $ 6.99
    $ 6.99

    Aquario Neo U-Clips

    Running standard flexible tubing over a sharp aquarium glass edge is an open invitation for kinks and pinches. Over time, that subtle bend at the r...

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    $ 6.99 - $ 6.99
    $ 6.99
    $ 6.99 - $ 6.99
    $ 6.99
  • Aquario Neo CO2 Tiny Curved Diffuser made of acrylic for efficient CO2 diffusion in aquarium setups.
    Aquario Neo CO2 Tiny Curved Diffuser made of acrylic, designed for efficient CO2 diffusion in aquariums.
    Save 26% Save %
    $ 22.99
    $ 22.99 - $ 22.99
    $ 22.99
    $ 16.99
    $ 16.99 - $ 16.99
    $ 16.99

    Aquario Neo CO2 Curved Diffuser - Tiny

    When you are managing a delicate nano tank or micro desktop setup, keeping equipment out of sight is everything. The Aquario Neo CO₂ Curved Tiny ta...

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    $ 22.99
    $ 22.99 - $ 22.99
    $ 22.99
    $ 16.99
    $ 16.99 - $ 16.99
    $ 16.99
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  • Aquario Neo CO2 curved special diffuser for aquarium CO2 injection, compact and efficient for even gas distribution.
    Aquario Neo CO2 curved acrylic diffuser for aquarium, designed for efficient CO2 dispersion in aquatic tanks.
    Save up to 26% Save %
    $ 0.00 - $ 25.19
    $ 0.00 - $ 25.19
    $ 0.00
    $ 16.99 - $ 20.99
    $ 16.99 - $ 20.99
    $ 16.99

    Aquario Neo CO2 Curved Special Diffuser

    The Aquario Neo CO₂ Curved Special series is all about keeping things as clean and minimalist as possible. By taking a factory pre-bent neck and ho...

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    $ 0.00 - $ 25.19
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    $ 16.99 - $ 20.99
    $ 16.99 - $ 20.99
    $ 16.99
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  • Acrylic Aquario Neo CO2 Curved Original Diffuser for aquarium CO2 injection system, showcasing its curved design.
    Aquario Neo CO2 Curved Original Diffuser made of acrylic, designed for efficient CO2 diffusion in aquariums.
    Save up to 26% Save %
    $ 18.99 - $ 22.99
    $ 18.99 - $ 22.99
    $ 18.99
    $ 14.99 - $ 16.99
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    $ 14.99

    Aquario Neo CO2 Curved Original Diffuser

    The Aquario Neo CO₂ Curved Original series brings a clever twist to the classic Original line. It features a factory-pre-bent neck that hooks clean...

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    $ 18.99 - $ 22.99
    $ 18.99 - $ 22.99
    $ 18.99
    $ 14.99 - $ 16.99
    $ 14.99 - $ 16.99
    $ 14.99
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  • Aquario Neo CO2 Extended Original Diffuser for aquarium CO2 injection, with fine bubble dispersion visible in the image.
    Aquario Neo CO2 Extended Original Diffuser for aquarium CO2 systems, made of acrylic with fine diffusion mesh.
    Save up to 26% Save %
    $ 18.99 - $ 22.99
    $ 18.99 - $ 22.99
    $ 18.99
    $ 14.99 - $ 16.99
    $ 14.99 - $ 16.99
    $ 14.99

    Aquario Neo CO2 Extended Original Diffuser

    If you are running a deeper display tank or a setup with a bit more vertical height, standard short diffusers just won't cut it. The Aquario Neo CO...

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    $ 18.99 - $ 22.99
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    $ 18.99
    $ 14.99 - $ 16.99
    $ 14.99 - $ 16.99
    $ 14.99
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  • Aquario Neo CO2 normal special diffuser for aquarium, made of acrylic, enhances CO2 dispersion in aquatic environments.
    Aquario Neo CO2 normal special diffuser for aquarium, acrylic construction, designed to diffuse CO2 efficiently in aquatic tanks.
    Save up to 29% Save %
    $ 0.00 - $ 20.99
    $ 0.00 - $ 20.99
    $ 0.00
    $ 13.50 - $ 15.00
    $ 13.50 - $ 15.00
    $ 13.50

    Aquario Neo CO2 Normal Special Diffuser

    If you already use an external or regulator-mounted bubble counter under your cabinet, you don't need another one hogging space inside your display...

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    $ 0.00 - $ 20.99
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    $ 0.00
    $ 13.50 - $ 15.00
    $ 13.50 - $ 15.00
    $ 13.50
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  • UNS Pro CO2 manifold block for CO2 systems, featuring multiple outlets and control valves for precise gas management.
    UNS Pro CO2 Manifold Block for CO2 systems, featuring multiple ports and durable metal construction by UNSCO2.
    $ 34.99 - $ 124.99
    $ 34.99 - $ 124.99
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    $ 34.99

    UNS Pro CO2 Manifold Block

    The UNS Pro CO₂ Manifold Block is an add-on extension designed to clip directly onto your existing UNS Pro Dual Stage Regulator. By stacking these ...

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    $ 34.99 - $ 124.99
    $ 34.99 - $ 124.99
    $ 34.99 - $ 124.99
    $ 34.99
  • UNSCO2 CO2 paintball adapter in space grey, designed for easy connection and reliable performance in paintball equipment.
    UNS CO2 Paintball Adapter in space grey, designed for easy CO2 tank connection, featuring a compact and durable build.
    $ 12.99 - $ 12.99
    $ 12.99
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    $ 12.99

    UNS CO2 Paintball Adapter - Space Grey

    Attach your CO2 regulator to a paintball CO2 tank using this adapter! A built-in pressure relief hole is included for increased safety measures whe...

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    $ 12.99 - $ 12.99
    $ 12.99
    $ 12.99 - $ 12.99
    $ 12.99
  • UNS Mini Dual Stage CO2 Regulator for precise control of CO2 flow, featuring dual gauges and compact design.
    UNS Mini Dual Stage CO2 Regulator for precise CO2 control, featuring dual gauges and compact design.
    $ 157.99 - $ 157.99
    $ 157.99
    $ 157.99 - $ 157.99
    $ 157.99

    UNS Mini Dual Stage CO2 Regulator

    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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    $ 157.99 - $ 157.99
    $ 157.99
    $ 157.99 - $ 157.99
    $ 157.99
  • UNS Advanced Check Valve for CO2 systems, showing the compact brass valve with inlet and outlet connections for reliable flow control.
    UNSCO2 CO2 check valve with threaded metal fittings, compact design, and durable construction for gas flow control.
    $ 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
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    $ 9.99
  • Acrylic Twinstar CO2 diffuser for aquarium, showcasing the clear, compact device with fine ceramic disc for efficient CO2 dispersion.
    Twinstar CO2 diffuser made of acrylic, designed for aquarium CO2 systems, featuring a sleek, clear acrylic construction for efficient gas dispersion.
    $ 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
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    $ 12.99
  • Aquario Neo CO2 DIY kit for aquarium plants, featuring CO2 regulator, diffuser, and tubing for easy setup.
    Aquario Neo CO2 Refill for DIY CO2 kit, showing a refill canister 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 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
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  • 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
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    $ 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
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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
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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
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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
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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
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    $ 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
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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
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    $ 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
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    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
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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.