I think it because of mold.and the exchange of co2 and o2 during the dark time.I'am not for sure. Peace
crazywill Reviewed by crazywill on . humidity :thumbsup: during the light`s on (18/6) my humidity is 55 - 70%.....what humidity level do I keep during the light`s off cycle ? flood & drain sys whit clone in veg ! :smokin: Rating: 5