I've been running my terrarium setup for a couple weeks now and it seems to be working well for my plants. I have a fan that blows over my tank, right over a small opening along the middle of the top (in between my two flourescent bulbs), and I also have an air pump and airstones that pump air into my water at the bottom of my tank 24/7. With the air pump doing its thing, do I even need the fan blowing into the tank?