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I have a topless 6 gallon with a 70w mh and evaporation was pretty insane. I went to a hardware store and had a piece of glass cut to cover most of the top and it really helped. now i can go days without topping off. heat may become an issue in the summer, but it works fine for now. Under a hood, a MH would REALLY heat up a tank, and I can't think of any easy solution. I would consider going topless, i've had both and it looks better anyway IMO.
Last edited by Conductive; 12/24/2007 at 09:26 PM.
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