I just want some opinions on which metal halide bulb and ballast to use for my tank. I have an 8o gallon with six 55 watt pcs with electronic ballasts 4 50/50s and 2 actinics. I would like to go with just 2 250 watt xms with electronic ballasts. Would I need a chiller or could i just use fans? the top of my hood is only five or six inches off the water. What other kind of ballast and bulbs would u suggest? I have softies, lps, and a couple of sps frags. Will electronic really save me that much more?