Fluval CO2 Indicator Set - Monitor CO2 Levels


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The Fluval CO2 Indicator set is used to monitor approximate CO2 levels and also helps gauge CO2 levels in aquariums.

The kit includes :

  • CO2 Indicator
  • 10 mL (0.34 fl oz) CO2 Indicator Solution
  • Color reference sticker to gauge CO2 levels
Fluval Works with Models
CO2 Indicator Set Any Brand CO2

Dimensions: 1.125 in x 1.5 in x 1.75 in


  • Detach reservoir from the cap of the Fluval CO2 indicator
  • Add 1 mL of the Co2 Indicator Solution to the resevoir of the CO2 indicator (Fill up to the clear line). and reattach both parts of the CO2 Indicator. Do not add water.
  • Place CO2 Indicator vertically inside of the tank (cone facing up) and attach to the wall of the tank using the suction cup.
  • Place the color check sticker over the suction cup on the outside wall of the aquarium.
  • Note: it is recommended to change the CO2 Indicator Solution every 2 - 4 weeks
  • It is also strongly recommended to regularly monitor pH and KH levels as well.