OUch. that stinks.. YOu put a butterfly in your reef?! what kind? the one I had was invisible for like 2 months. never saw him. never came out. hid all the time. Then one day we noticed the tank had never looked better and had Zero green on the rocks. then he started to come out a bit. did great for a long time, then decided to nibble on polyps, and that was the end of that fish. Very pretty. I may try to go with some in the new tank. but IDK. they scare me. part of me thinks that with the size of the reef, one fish cant do that much damage...but you never know.