I've had two Potter's angels, and neither of them I saw picking at any coral.
I will say that you should stay away from the larger ones in stores, they never seem to be eating. Both the current one I have, and the one that died last year (huricane power outage), were pretty small, between 1" and 1.5" Each one was eating by the next day.
Frag: The tank has been set up a little more than a year.
I'll probably get some more photos up tommorow.
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