i wne to my lfs called aquatic warehouse if anyone ever heared of it. I want to keep clams in my 40g and i wanted a MH buld but they said that it would not work out because it would just totaly heat up my water. Is this true, and if i can put a MH bulb in my 40g how many watts is recomended . I probably just want 2 clams and some corals. Any info is greatly appreciated!