Houston We Have A Problem

This morning I woke up to find my Butterfly Tang stuck to the overflow box. I'm pissed, this is the first fish I have lost. I'm pissed because he was beautiful and cost me $40!! Now I have to figure out how to solve this problem. I really didn't think that the suction was that strong going into the overflow, guess I was wrong. I guess I could raise it just a bit and hope that it doesn't happen again. Whats weird is I have a little Firefish that swims around it all day long!! Go figure!