Rather than make another thread I figured I would add to this one. Along with this fixture I have two 36" single bulb Hagen Glo T5 fixtures that I put in my canopy also ( my canopy is open top with the fixtures recessed 12" above my tank along with my MH fixture). So far heat dissplacemt hasn't beena problem yet. I have in these two T5 fixtures a marine glo bulb in each. Here's my question, If I turn these T5"s on say two hours before and after My MH's kick on,how long do I need to keep my MH fixture on? I have leather corals, mushroom corals, 1 christmas tree, 1 green branching hammer, 1 bubble coral, rock flower anemones, inverts and a few fish which are reef safe. Would a lighting of blue on two hours first, than MH's on for 6hrs and than blue on for 2 hrs after be good? Any and all ideas would greatly help. I never had MH's before last week.