It is either your angels, emrald crabs or cleaner shrimp.
I would bet that it is your angels, you have seen one peck before. I gaurantee it hasn't stopped. Most times when clams are being picked on by fish the reefkeeper never see's it happening.
They know when you are watching.
You have a choice, clams or angels.
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Well, I'm off to give my reef a 30 min freshwater dip!!
That should fix it everything right???
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