My BTA has been on the move now for a couple of weeks. I'm constantly moving corals out of his way since he's already killed two and damaged some others. Good thing I'm home all day during the summer so I can keep an eye on him. One thing that seems to help is to nudge him with a pair of tongs. This sort of gets him out of the way so I can safely move my corals. But, if yours is actually on top of your polyps, you're probably not going to be able to move him. I'd wait until your lights go out tonight and see if he moves.