I run a 250MH + 2x24w t5ho Giesemann Neptune fixture on a shallow 15g tank (36"x12"x8") with a water line at ~7.5" and the fixture ~6" above the water. My SPS, BTA and candy canes love it. Temperatures can raise a bit during the day, but that's mainly because I have a cover over the tank to prevent my goby from jumping.
-Rich
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