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Does any one have a spiny oyster? recently we noticed ours has these black lumpy mass on its outer shell? anyone know what it could be

We had a cleaner shrimp for 4 months and all was fine, he was eating and cleaning and moving around fine all night. we got up in the morning to find the cleaner shrimp, wrasse and coral beauty all 4 months old and fine earlier dead in the same spot. We did recently find a hitch hiker urchin...