came home and bubble-tip has gone into the cave and doesn't look good. Only thing that happened when I was gone was some picking on a leather coral it could just be he's pissed about something
Need some more specifics like water chemistry, how long your tank has been setup, etc.
I have my new leather (got it yesterday) in my tank and my anemone is acting exactly the same, and this is in a 30 gallon tank.