How To Read Co2 Drop Checker?
1. When your co2 is off the drop checker solution will be a deep blue color.
2. After co2 has been on for around 30 minutes you should notice the color change. The optimal co2 concentration will be at 30ppm which will be a green-light green color.
3. If it remains blue your co2 is too low. If the color turns yellow then your levels are too high and may harm your fish. or turns yellow then your levels are too high and may harm your fish.