Nassarius snail help!

[fishoholic]

My nassarius snails are missing most of their tube-like siphons. They are still slowly moving about the tank but I'm wondering if they will be ok without their tube-like siphon. I think that my CBB ate the tube part on them thinking it was a worm or something, this is just my best guess as to what could of happened. Is this very bad? Anyone know if they'll be ok long term without it? Thanks Laurie. I should add that they do have a little bit of a stub left, but it looks a lot smaller then it did.