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Was he cleaning the shell or picking at the flesh? Shrimp are fine with clams but the minute the clam starts to take a turn for the worse a shrimp will be all over it.
He was on the flesh. But it is hard to say if it was not eating debris off it. I just fed some flake food a few minutes before I noticed. The clam looks okay no signs of death. I really was not sure if shrimp and clams can coexist peacefully.