Every kit comes with 1 glass drop checker, 1 suction cup, 1 10ml CO2 indicator solution, 1 2ml syringe, and 1 color chart. Simply add 5 drops of CO2 indicator into the glass checker and make sure it is stored in the bulbous side of the valve with the opening facing down.
Attach this to the side of your tank with the suction cup, completely submerged in the tank water and wait for up to 2 hours. If the blue CO2 indicator turns green, that’s the right balance of CO2. If it turns yellow, your tank has excessive CO2. Make the necessary adjustments, empty your glass valve and repeat the test until you get green.
A healthy tank has a carbon dioxide to the water level that contains anywhere between 20 to 40 ppm (parts per million). 30 ppm is the optimal level that is healthy for both plants and fish. So the next time you are worried about your plants and fishes having too much or too little carbon dioxide in the tank, keep your hobby and enjoy your time as an aquarium owner with this easy-to-use Rhinox Glass Drop Checker Kit.