Clam compatability?

i am think of adding a few clams to my tank. just wondering what is clam not compatable with? in other words, what animal would eat or kill a clam?
 
be careful with any butterfly fish as well. If they nip at corals, they may nip the mantle and ultimately kill the clam.
 
i have a coral beauty, but she does not messes with any corals. would the clam be ok with that fish?
 
and then not only could u lose the clam, but the fish too, i have seen pics here and reef central where a fish got caught mouth first in a clam
 
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