I had MH on my last tank, and ended up cooking it when I was out of town during a hot spell. Came back and all my corals were melted, and most fish and inverts were dead. I'm sticking with T5's... to be safe. From people that I've talked to, and setups that I've seen, you can grow pretty much anything under the right t5 set up anyways, so why pay the extra power and worry about the extra heat???
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