CO2 Indicator. The CO2 Indicator is designed to indicate the amount of CO2 that is dissolved in the water. The level of CO2 in your aquarium is indicated by the colour of the test solution within the sphere. This is important because too much CO2 is toxic to the fish and too little will limit the plant growth.
Directions: Open the plastic sphere and take care not to loose the green ball. Drop 15ml (15 drops) of the monitoring solution into the front cover. Close the plastic sphere and attach the suction cup. Place vertically into the aquarium with the indicator ball at the top. Replace indicating solution after 30 days.
Indicator: Blue CO2 level is low. Green CO2 level is OK. Yellow CO2 level is too high
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