I have an established 75 gallon reef tank with an orbit florecent fixture on it. I would like to change to Metal Halides. I have been iching to get some hard corals. I was thinking about getting a 48" 2 X 250 watt sunpod. I have talked to two local pet stores about lighting and am getting different advice. One says that i cant go over 2 X 150 watt fixture because I will burn the corals. the other said that 250 watt bulbs are fine. Just to keep soft corals low. Please let me know. I have money burning a hole in my pocket waiting to buy.