QUOTE (crazyeyez @ Oct 21 2009, 01:36 AM)

I have enough light, the growing space is so small I only have to open it twice a day but I will put the fan in again. Do I leave the fan on during nights?
From your profile mate...
QUOTE
A small closet, 2mX1,5mX0,6m. I have covered the inside with aluminum foil. I have two 32w "cool white" lightbulps, for growth, and a 125w "red light" flowering lightbulp. And a normal 32w householdfan for air circulation.
That's not that small and you ain't got enough light - ideally you'd want it full of plants and with a 400w or a couple of 250w HPS in there. A circulation fan is good, but you also need an
extraction fan (with a carbon filter for the smells) to pull air out of the closet, and some sort of intake (can be passive) to allow fresh air in. It's not just about temps, plants need plenty of CO
2 and can deplete it quickly in unventilated spaces.
Fans circulation and extraction should run 24/7.