I have one of these in my shopping cart on attitude. (Mah lady's gettin' me a good present this year :bigjoint: ) I think I'll keep it in there. Just to try it after seeing that pic.
Keep topping them. I have a friend who I gave a grape clone to a year ago and he's still veg-ing it 'cause he doesn't have the money to get a big light...haha. It's a friggin' bush, I'll tell you what.
I've got one in a 6'x2'x3.5' 1/2 closet with one computer fan and it's doing great!
You should be good w/ a fan or two. But I suppose it all depends on how hot your house is too. I keep my heat at a toasty 60 degrees. Haha.
Get bigger pots. Mine are always like rootbound after they're 3-4 in...the way I get em out is just to cut down a side of the cup and then continue across the bottom then peel the cup away.