I had something somewhat similar happen due to a very hungry nassarius snail that went after my lion's fins.
You might want to add some food specifically for the hermits, though I just don't keep hermits because they can be very aggressive that way.
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300DD, MRC MR-3 skimmer with dual Becketts, two Reefbreeders.com value LED fixtures, MRC fluidized reactor with GFO & GAC.
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