The best coral growth and color I have ever had was from a 250W metal halide over a 29 gallon bowfront. Supplimented with a 2X24W actinic T5 Fixture. It was amazing. It was also only hung 4" over the surface.
My light schedule was T5's on from 9:00 am to 10:00 pm and Halide on From 12:00pm to 8:00 pm. Worked great for me.
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They call it addiction for a reason...
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