Quote Originally Posted by cypher420
As of right now i've got a tent grow with ventilation and everything and i'm on my 12/12. During the light time the humidty is constant around 45-50% humidity. At night I turn everything off (including exhaust fan) and patch up the vent holes so no light can come in. the problem with this is at night the humidity in the tent is reaching up to 70% which i'm assuming can be bad and cause mold.

should i be keeping my exhaust fan on all night as well? only problem with that is in the morning the area outside the tent gets a bit bright and could leak light in thru vent holes which would need to stay open for airflow.


any suggestions?
Just like you, plants like to have fresh air even when they sleep. You need to keep fresh air for them, and there should be a fan inside to blow across the plants. If there is light coming out the vents, you will need to remedy it, and I would try it first by buying a can of FLAT (non reflective) black spray paint. WalMart has them for 99 cents a can. Then spray the inside ends of the vent pipe. Other methods also work.