I enclosed the top of my tank and used 3 small 4" fans through floor vents to keep it cool. This worked with only one 400W MH fixture (which also had an ice cap fan). However, I added a second 400W MH pendent with no fan and it is too hot. My fans are on the same timer as my MH lights. I currently have the doors above the tank constantly open (looks ugly).
Are you planning on going reef? I am considering the Solaris LED lighting (less heat but $$$$) or eventually going to a Fish only system and using fluorescent lighting. Consider using several fans (larger than the small computer fans) or somehow venting it to the outside.
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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