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Aquarium CO2 Accessories

  • Aquario Neo Fluid No CO2 liquid fertilizer for aquatic plants, showing a clear bottle with label and green cap.
    Aquario Neo Fluid No CO2 liquid fertilizer for aquatic plants, water conditioner for healthy freshwater aquarium ecosystems.
    $ 20.99 - $ 20.99
    $ 20.99
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    $ 20.99

    Aquario Neo Fluid No CO2 - Liquid Fertilizer

    Aquario Neo Fluid No CO₂ is a complete liquid fertilizer designed for planted aquariums without CO₂ injection. The formula contains nitrogen, phosp...

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    $ 20.99 - $ 20.99
    $ 20.99
    $ 20.99 - $ 20.99
    $ 20.99
  • UNSCO2 CO2 solenoid spring switch replacement accessory, featuring a compact metal component for controlling gas flow.
    UNSCO2 CO2 solenoid spring switch replacement, an accessory with a coil and spring mechanism for controlling gas flow.
    $ 18.99 - $ 18.99
    $ 18.99
    $ 18.99 - $ 18.99
    $ 18.99

    CO2 Solenoid - Spring Switch Replacement

    Your solenoid is the electronic gateway of your CO₂ system. When your timer clicks off at night, the solenoid is supposed to shut tight to prevent ...

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    $ 18.99 - $ 18.99
    $ 18.99
    $ 18.99 - $ 18.99
    $ 18.99
  • UNS Micro CO2 solenoid valve used for precise CO2 control in industrial or aquarium systems, with compact design.
    UNS Micro CO2 Solenoid valve for controlling CO2 flow, compact and durable industrial component by UNSCO2.
    $ 24.99 - $ 24.99
    $ 24.99
    $ 24.99 - $ 24.99
    $ 24.99

    UNS Micro CO2 Solenoid

    The UNS Micro CO₂ Solenoid is the brain of your gas setup, allowing you to completely automate your tank's schedule. Simply plug it into a standard...

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    $ 24.99 - $ 24.99
    $ 24.99
    $ 24.99 - $ 24.99
    $ 24.99
  • Aquario Neo CO2 Tiny Diffuser for aquarium, compact acrylic CO2 diffuser for efficient gas dispersion.
    Acrylic Aquario Neo CO2 Tiny Diffuser for aquarium CO2 injection, compact and precise for efficient gas diffusion.
    $ 17.89 - $ 17.89
    $ 17.89
    $ 17.89 - $ 17.89
    $ 17.89

    Aquario Neo CO2 Normal Diffuser - Tiny

    When you’re high‑tech aquascaping a nano or desktop cube, every inch counts. Made from crystal‑clear, shatterproof acrylic, the Aquario Neo CO₂ Nor...

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    $ 17.89 - $ 17.89
    $ 17.89
    $ 17.89 - $ 17.89
    $ 17.89
  • 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.
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    $ 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
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    $ 16.99
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    $ 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
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    $ 16.99 - $ 20.99
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    $ 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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    $ 0.00
    $ 16.99 - $ 20.99
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    $ 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
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    $ 18.99
    $ 14.99 - $ 16.99
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  • Aquario Neo CO2 curved original diffuser for aquarium CO2 injection, with a sleek design and precise dispersion.
    Aquario Neo CO2 Extended Original Diffuser for aquarium CO2 systems, made of acrylic with fine diffusion mesh.
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    $ 18.99 - $ 22.99
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    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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  • 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.
    $ 21.99 - $ 21.99
    $ 21.99
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    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
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    $ 21.99
  • 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
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    $ 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
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  • 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
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    $ 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
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  • 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
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    $ 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
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    $ 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
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    $ 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 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
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    $ 22.99
    $ 16.99
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    $ 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
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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
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    $ 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
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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
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    $ 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
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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.