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From what I've read about Berghia (or Aeolidella stephanieae), they only live as long as they have aiptasia to eat. Then they starve and die. As Leslie said, most of these little guys are pests on corals that you want to have, including zoas, and I think some or all are specific to different coral types. If it was in my tank I'd remove it immediately and start checkin my zoas and acropora for signs of more, and for signs of any eggs. My bet is on it being a bad guy.
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