I have 2 se MH 250 on my tank, its only 44 g but is narrow and 4ft long. I dont have a problem with the heat as I leave my canopy open on top and the back. even when its really hot out I drop a couple of 1L pop bottles of ice in the sump and I'm good to go.
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Starting fresh ... 90 gal, 40gal sump, sundial T5HO x 4, 2 x koralia 2's, ASM G1X skimmer 
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