well, my as well pop my cherry and do my first post. I have a 92 corner witha 175 watt metal halide in the middle of the canopy. infront and behind it, i have 2 28 watt powercompacts for actinic supplementation. On the sides that touch the wall, i have 2 65 watt power compacts once again for more actinic supplementation. In the very back near the overflow, there is a 96 watt power compact quad 50/50 to help brighten up the back. So far my clam is doing great, xenias doing well, as well as all my colts. My corraline is still growing over everything, my bubble coral along with my fox coral and pearl bubble are all very happy as well as the mushrooms at the mouth of a cave. all i have is one 4 inch fan from target cooling the hood, and the temp never goes above 80.5. It starts off around 78 in the morning and 14 hours later (i know i give my tank to much light but hey, i like looking at it) its at 80 or so. I don't think thats all too bad considering what i have. I can keep all the corals perfectly fine, even some of the sps frags that came on my live rock, including some fire coral. on a side note, would i notice a big jump if i switched to a 250 watt mh? also, how much of a temp increase could i expect?...i'm running these current temps without a chiller and really don't want to get one. Oh, the ambient room temp is 76-75 if that helps at all.