my humidity is at 25 before using the humidifier and my bottom set of leavs are starting to yellow and curl so i decided to raise the humidity a bit to see if it cures that so my question is could i leave the humidifier on over night or 24/7 or only for a few hours a day (like around 4)
What I did was purchased a humidifier with a digital screen that allowed me to set what humidity level I wanted and I leave it on 24/7 set at 50% humidty
Humidity during Veg should be around 40-60% humidity and during flowering 20%-45%, flowering is generally the only time during a grow when you should have to worry about mold