I was dead set against MH and wanted straight T5's for my 31x19x19 53g tank. I ended up going with a MH/T5 combo light because I got tired of waiting for the T5 I wanted (powermodule). I'm SO glad I ended up with the MH/T5 combo light (Elos Planet) !!! The tank is BRILLIANT and sparkles when both the MH and T5's are lit. If I turn off the MH and have just the T5 bulbs lit, it's bright, but very "flat" in comparison. Everyone talked about the shimmer effect of MH, and I didn't get it.....until I bought my light! If I had to do it again....I'd definitely get the MH/T5 combo. Best of both worlds, and now, I'll never be limited on what coral I can add.
Pam