Switched from MH to 72" Constellation. Couldn't be happier. I do miss the shimmer, but no heat and no shadows. Temp. is steady day and night. Coral growth and color is awesome. The advantage I have is tank is 18" wide and fixture is 14" wide. I'm running a DSB so bottom of tank is only 19" from water surface. So light provides great coverage and intensity. I wouldn't think T-5s would have good par on a 30" deep tank though. I think each person should make a decision based on tank dimensions and what he/she intends to keep.
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