Actually I have thought about putting a MH on my sump/fuge as well. I have a sheet of plywood between my tank and the sump but I think there will still be heat issues to deal with and would probably have to use a fan to get it out.
My thought on using the MH was to use a portion of the sump as a frag grow out by setting up racks in there.
Right now I probably don't have to worry too much about heat but if I ever get my stand enclosure it would definately be an issue.
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