Drop checker changing to low CO2 overnight?
I have installed the Waterplant brand CO2 drop checker recommended by others on this forum. It performs continuous monitoring, during which blue indicates too little CO2, green is right, yellow is too high.
It appears that my tank is green during the day when the lights are on and the CO2 is running, but blue by morning, after my solenoid has kept the CO2 off for 15 hours.
I assume this is okay and not a sign that my overall CO2 is too low, but please let me know what you think.