What crabs/snails/fish DON'T mix well with clams?

[keqwow]

I am in the process of planning out my tank, and I am trying to figure out what inhabitants I can keep together. I would ultimately like to have one or two T. Croceas. Of course I've read that some crabs/snails/fish will either predate, or at least nibble on them. What varieties of crabs/snails/fish can I keep with Croceas....or perhaps, the list would be shorter if people could name of the crabs/snails in particular that DEFINITELY don't mix well with the clams? I know some Anglefish can be a problem...has anyone kept the Flame Anglefish with clams? How well do they mix? I'd really like to be able to keep some crabs in the tank along with the clams, but I don't want them eating each other..so suggestions on what crabs I might be able to keep without having problems would be great. Thanks.