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Light, water and CO2. CO2Art makes the CO2 gear.

Pressurised CO2 equipment for planted aquariums: every part between the cylinder and the leaves.

Shop for your tankStock CO2Art in your shop
A planted aquarium with a dense green carpet; a glass diffuser releases a fine mist of CO2

Who we are

We make one thing: the equipment that takes CO2 from a cylinder to the leaves of aquarium plants.

  • 13+ years of aquarium CO2
  • 50,000+ aquascapers worldwide
  • 4.8/5 over 5,000+ reviews
A slope of moss and ferns in a planted aquarium; neon tetras and harlequin rasboras swim past

Dense plants need CO2.Moss, carpets and stems are the first to slow down without it.

Why a planted aquarium needs CO2

Plants pearling: small oxygen bubbles on the leaves while fish swim past

Plants build their leaves from carbon, and in water the carbon comes as dissolved CO2.

A planted tank runs short of it within hours of the lights coming on, and the plants slow down while algae keep going.

Feed CO2 steadily through the light period and the plants keep growing. When they pearl, the silver bubbles on the leaves are the oxygen they give off.

How the gas gets there

From the cylinder to the plants

The gas passes three stages on its way into the water; the drop checker in the tank shows the result.

  1. Stage 1 of 3

    Dual-stage regulator

    Takes the cylinder's pressure down in two steps, so the flow stays the same from a full cylinder to an empty one.

    EU storeUS store

  2. Stage 2 of 3

    Bubble counter, check valve and tubing

    Shows the flow as bubbles you can count, stops water running back, and carries the gas to the tank.

    EU storeUS store

  3. Stage 3 of 3

    Diffuser

    Breaks the gas into a mist fine enough for the water to take in before it reaches the surface.

    EU storeUS store

  4. In the water

    The drop checker

    Hangs inside the tank and changes colour with the CO2 in the water: blue for too little, green for what the plants need, yellow for too much. It sits with the accessories in both stores.

A diffuser among driftwood roots turns the CO2 into a cloud of tiny bubbles

Bubbles like dust.Learn what makes a CO2 setup work, before you buy any of it.

Learn the basics

Cover of the e-book 12 Things You Need to Know When Starting a Planted Aquarium

12 Things You Need to Know When Starting a Planted Aquarium

Our e-book for a first planted tank: light, soil, plants, CO2 and the mistakes that cost the most. PDF and EPUB.

€20 in the European store$20 in the US store

Tanks our customers run.

We call them CO2Artists: aquascapers who run their planted tanks on our CO2 and post what grows, from a carpet filling in to stems turning red. We pick from what they share and show it here, credited and linked to the original post. Tag @co2art on your own tank and it may turn up here.

See every tank on the CO2Artists wall Share your tank: tag @co2art

      Stock CO2Art in your shop

      Talk to our trade team now, or sign in and order on your region's trade portal.

      13+ years of aquarium CO2, 50,000+ aquascapers worldwide, and 4.8/5 over 5,000+ reviews.

      We reply within one working day on the trade chat: our assistant answers first, and a person from the trade team takes over.

      A planted aquarium lit in a dark room, fed by a CO2Art regulator on a cylinder beside the cabinet

      Sign in or apply on your region's portal

      One trade portal per region: Europe, Canada and the rest of the world order at trade.co2art.com, the United States at trade.co2art.us.

      Europe, Canada and the rest of the worldtrade.co2art.com

      Sign in to the Global trade portal Apply for a trade account on the Global portal

      United Statestrade.co2art.us

      Sign in to the US trade portal Apply for a trade account on the US portal
      Minimum order
      €300 on the European portal, $400 on the US portal.
      Dispatch
      Most orders leave the same or the next working day.

      How registration works

      1. Apply with your business details

        Your business e-mail, name, company and address. Shops in the EU add their VAT number on the European portal.

      2. Set your password

        The portal e-mails you a link to set it. You can sign in while you wait.

      3. We approve, you order

        Our trade team checks every application by hand. Once yours is approved, you see your trade prices and can order.

      Download the brochurePDF, 1.7 MB Find a partner shopShops and distributors that stock CO2Art, on a map: search a town or use your location. Partner warranty claimswarranty.co2art.com