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They are generally fine with CUC when small, but that can change as they grow. They also may (I stress may) eat shrimp and other crustaceans when they get large. My last one was a large male who eventually took a liking to escargot but left everything else alone.
A lot of people just chance it and if they become a problem get them out. They are pretty hard to catch however - I had to use a bottle trap to get my last one out. FWIW; you don't necessarily have to maintain a CUC. It's debatable (at least IMHO) just how efficient snails/hermits are at consuming algae/detritus anyway. Some feel the perception that CUC is a "necessity" is just a well marketed ploy by those who sell them.
What type of cuc do you keep. I'm only 6 months into the hobby and learning. I have an assortment of snails and crabs. Really like the activity of the crabs.