They are coral and other-fish safe. They've got pretty big mouths for their size, so I wouldn't trust them around really tiny types of ornamental shrimp. Other than that, I think they're fine. I've got four and (while I've only had them for a few months) I've never seen them bother anything.
i dont have any small shrimp or fish. i have some pretty big turbo snails. would they pick at zoas?