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I have a crocea clam. I have had him for about 2 years. While cleaning the tank today I noticed a spot on the outside of his shell about 3/4" below the ridge. It looks like his skin. Maybe the shell is cracked? He is doing fine, I'm just concerned. Had another clam in there for about 6 months. Took him out about 4 months ago (no room for both). Any info would be appreciated.