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Turn drop checker up-side-down so that the curved bend is at the bottom.
Add drops of drop checker solution.
Slowly rotate the drop checker so that the solution enters the bulb.
Repeat the above steps until the bulb is 1/2 full of the solution.
Attach the suction cup to the drop checker.
Press the drop checker inside the tank 3 inches below water level, ensuring you have air trapped inside the main body of the drop checker.
Try to position in area of aquarium where CO2 bubbles from the diffuser will not enter the drop checker and give inaccurate readings.
Wait at least 12 hours for color to accurately reflect the CO2 levels in the aquarium.
Adjust CO2 dosing in accordance to drop checker color:
If the color of the solution is yellow it indicates too much CO2 is present - reduce your CO2 dosing.
If the color of the solution is blue increase CO2 dose in small increments.
If the color is a light green you have the correct CO2 dosing.
Leave drop checker in aquarium for constant CO2 monitoring.
Change drop checker solution at least once every month.
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