Maintaining the precise CO2 level is very important in a planted aquarium. An excessive amount of CO2 would possibly harm your fish, whereas too little CO2 decreases plant growth and permits algae to take over. The CO2 indicator makes it easy so that you can know the CO2 level throughout the aquarium by comparing the colour of the reagent.
Product of top quality glass
3cm diameter, unique round form, very unobtrusive
Use to measure CO2 levels at a glance
Package included: 1x glass ball drop checker, 1x suction cups
Please note that CO2 indicator solution is NOT included