I saw a reference to benthic crustaceans, which is interesting since they're marine crustaceans. With what I read, I would think your RCS will probably be ok--mine move faster than the fish--unless one gets sick or dies, just like with a lot of scavenger type fish. planetcatfish doesn't say anything about it, and they're usually pretty good about putting in notes about that kind of stuff. You could try putting a few small ghost shrimp in the quarantine tank with them and seeing what happened.