Solenoid and stable CO2?
When my solenoid block the CO2 at night, after some hours the drop checker become blue.
So it's mean that my co2 level not stable? Or this is normal situation and won't promote algae?
My lighting schedule 2pm to 9pm.
My co2 schedule from 7am to 9pm.
When the light on, the drop checker is green.
Thanks for advice.