My set-up (75 gallon) is new, but I have lots of hermit crabs and one amazing CBS. I've been feeding the CBS a little piece of shrimp every other day, and he hasn't bothered the hermits at all. He walks over them, and comes out when I approach the aquarium. We all love watching him. Hope my experience doesn't change, but so far so good with the CBS!
But I forgot that we're talking a 10-
gal. set-up here! Probably not enough space!!