Thanks SJWitt,
The rock it was actually attached to when I bought it, of course still attached to, has a little hole that you can't see in the pic.
I suppose the BTA started to get too large for that hole and subsequently moved out of that spot over the weekend. I thought it was splitting at first, but it moved over about 2 inches outside of the hole it was in.
Doing very well. I never feed it deliberately. I always put frozen mysis in the water and kind of wave some of the food its way. It has responded very well to that and is coloring up nicely.
Probably the best luck with a BTA I have had in a while. I used RSCP mainly and have used it in my last couple of water changes. My corals always do well on that salt and I have no issue mixing it.