Hey
I just made the switch from 4-HO T5's , to 250W Metal Halide over my 33G sumpless. I made a canopy that hangs from my ceiling (making sure there was lots of space for the heat to escape) it is currently 10 inches away from the waterline of my tank, but is adjustable. Overheating was a huge concern of mine especially on such a small tank. So I installed two "whisper fans" one on each end. When these fans are on the tank temp. doen't even get as warm as when I had the T5's directly on the tank. As for the corals I've never seen them happier! The switch is possible, it may take more creativity and patience but it's worth it, BIG TIME. Good Luck!
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