Hi, I am presently troubled by the heat emitted from my new PCs. They seem to affect the temperature of my tank pretty much,and has gone up to 88-90F, needless to say my corals dont welcome the heat too well. The bulbs are now presently about 5inches away from the water surface. Would like to get an opinion from some of you how high the lights should be if I wish to bring down the temperature to about 84-86F, and yet still not lose the effectiveness of the light. Sorry I still cant figure out where to install fans,I really dont wish to install them if i could help it.Thanks!