I have a couple BTAs and I can attest that they will wander where they want which is almost never where we want them. As for feeding, a lot will depend on how quickly it settles. Never 'force' an anemone to eat. When its settled and straightens its tentacles (They are inflated but no bubbles on the tips), it is ready for some silver sides. Make sure to cut it up small enough for the poor thing to eat. When an anemone does not want food, it will simply let it drop and you should take the hint. If it does eat, you can expect in a day or two it will shrivel up and look, well, ill. Its excreting waste, so let it be. When its all done, maybe later that day or in the next couple, it will resume inflating its bubbles or look hungry again. Its a vicious cycle! ; )
To fail to plan is to plan to fail.