Generally speaking anemones need flow. It's the type of current that is an issue. The BTA needs a spot to hide the pedal disk (aka "foot") from bright light/high current, thus in a crevasse, or under an overhang, but can from there reach into the current and light. If the flow patterns aren't to it's liking it will likely wander.
I wouldn't really consider BTA's a low flow species though. You can find them in 5 feet of depth at the reef, there's plenty surging wave action at that depth, but you'll find them nestled in brancy (or "holey") rock, etc. where there is plenty of opportunities for self-adjustment.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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