I have 70W metal halide over my 10 gallon tank and have only LPS and softies (overkill, I know). The open brain and mushroom don't seem to mind the light but one type of the zoas don't like being near the center of the tank and I have palys that bleach out when any higher than the sandbed. You could maximize your 'real estate' by choosing corals that have shorter sweepers.
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Calvin
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Planning a 29 gallon mixed reef...
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