The other thing to consider is that you said you basement was muggy until you covered your tank. The thing with putting the 400W bulbs over your tank is that the covered top is going to contribute further to heat in the tank. I know that I run both my large systems with open tops and as I said still have heat issues in my 190g even with the top open and fans blowing accross both the sump and the tank. I can't even imagine how hot this tank would get if I put the cover on.
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