I would suspect a hitchiker crab doing the work more that a damsel. But I'm probably wrong. I have found a crab after 8 months that I never new I had. It had a snail in his claws and was taking it back to his hide out. I know some hermits will keep picking at snails to get them to release from what ever they or on in hopes that they will turn over so they can eat them. JMO
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Marty
50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor
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