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I have never heard the clam part, though just about any fish will nip at a clam given the right conditions. Wrasses in that genus can go after CUC but their mouths are pretty small so they are not going to devastate a CUC, depending on whay you have. Same with cleaner shrimp, I think a well fed, comfortable wrasses is not going to pick off CUC, but any wrasse can be a risk.
I have one and it will go after a snail or crab if it sees it falling from it perch but it will not go after it intentionally. I also have 2 cleaner shrimp and a fire shimp that it pays no attention to.
I have 2 in my display 1 small and 1 large as well as a heinochous (checkerboard wrasse) beautiful creatures sure they migh go after the occasional snail but I restock my cuc about once a year and add then at night when he's buried sleeping in the sand