Don't worry too much about the BTA moving a lot. Initially, it may move around to find a spot it likes, but once it does it usually doesn't move very much at all. I put mine right over a crack between 2 rocks and it immediately put its foot into the hole and has not moved. When I kept my other BTA's years ago they didn't move from their spots move for years until they split and then one would move away.
My problem now is I must have captive bred clowns as they won't host anything. Which could be a blessing in disguise I guess.
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