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CO2 is the most important nutrient for plants. Without a CO2 supply, the plants will not thrive. CO2 System Bio is a simple solution that adds extra CO2 to the plants in the aquarium.


  • For improved growth of easy and medium plants
  • ~60 days CO2 for a low cost
  • Safe to use
  • Easy to refill and recycle
  • Great for aquarists new to CO2 injection. 


Comes ready to go with Activator Refil bags.


Tropica CO2 System Bio

  • We recommend 20-25 °C (68-77 °F) for the best use of this product.


    • Pour 300 ml of hot water in the bottle. Approx. 50 °C (122 °F).
    • Put on the cap (without air nozzle) and shake the bottle vigorously for one minute, or until the contents are thoroughly mixed.
    • Then leave the bottle at room temperature for a minimum of 24 hours until the content has turned into a solid mass.
    • At the same time, soak the CO2 Diffuser in clean water

      24 hours later
    • Add 1 portion of Activator in 200 ml of lukewarm water. Max. 35 °C (95 °F.
    • Leave for 5 minutes and stir until Activator is dissolved in the water.
    • Add the solution to the bottle.
    • Insert the gasket into the air cap and place the cap on the bottle.
    • Attach the air hose to the bottle and connect the bottle to the CO2 Diffuser.
    • Place the CO2 Diffuser in the aquarium.
    • Wait for CO2 production to start. This usually takes a few hours, depending on the temperature.