Well, zoanthid eating nudibranchs and/or a Eunicid worm could be culprits. You should find the nudis on the zoas, but the Eunicid could be in a rock halfway across the tank, and only come out at night.
Kevin
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Back in the pool, swimming with the sharks...
Current Tank Info: Red Sea 425XL w/Kessil AP700, Vertex 180i Skimmer, 2 x Vortech MP40s
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