yeah i prolly do need a fan but i have 2 separate boxes that are like 1'x1'x2' (1 for each plant) and it is hard enough to fit the pot and light in each. I just got a batch of 6 thai plants ripped up by my dad so i am trying to be super discrete til that blows over. I ate it though b/c they were 3 wks and 9'' with like 7 sets of leaves. I have made ventilation as suggested.