Luckily mines less than 24" deep. There are some great articles about growing SPS with t5 bulbs. So it's really Size vs power. I might start out with t5s and add MH later on, then I'd have strong lighting for corals on the bottom of the tank, and in the water column. PS: I fever did get what FOWLR meant. Is it some thing like "fish only with live rock"?