Anenomes will do this... Have patience!
BTW: I have a LTA that has been established in my system for over 2 years, always in the same spot, never moved and is host to my 2 Perc's, for the last 2 weeks, he has been floating around the tank. It can be aggravating I know. My 2 rose BTA's pretty much stay put, only the clone moves a little...