Sounds like they know something you don't. They will leave healthy clams alone. He could be picking at critters hiding in the shell, or he could be picking on the clam itself.
If it seems to be annoying the clam, I would separate them (different tanks, or different compartments or whatever). If the clam is not looking worse for wear, you could let it be. But keep an eye on things.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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