Well I couldn't find anybody to come look at the flooring in my house so I guess I won't gettting my tank on 7/18 I was planning on 84x24x24 but now I have plenty of time to really thinik this out and think about my overflows and everything. I think 3x250mh's will be fine for a 7ft long tank, do you think I could even get away with a 8ft tank or will I really need a 4th mh?