You are absolutely on the money with your explanation Whoyah! Our problem with the nuisance algae in the one tank is that there are only 2 Tangs in there and one Engineer Goby. It's not overfeeding in this case either, it's to much light. There are only two corals in the tank at this time (hydronaphora -sp?) I'm waiting for the money fairy to come visit me and stock me up with more coral, and fish. For now, what needs to happen is to shorten the photo period. I'll take the hydronaphora out of there, and really shorten the photo period as they don't really need the fantastic metal halide lighting that's in the tank. ...Angel