A coral banded shrimp will eat just about anything you put into the tank as far as food goes but myself personally have never heard of or witnessed a coral banded shrimp attacking other livestock other than another coral banded shrimp..you'll be alright
Brian
the CBS we had didn't eat or bother the hermits...he did eat the peppermint shrimp...tried to grab the fish but the fish are smart and just stayed away from the CBS's rock...saw CBS try to pick on the stars...then he became food for the star...
i have a pair and they just chill out under their rock. they some some agressive towards the fish but nothing serious. The fish pretty much ignore them. I have never seen them (this being the CBS) even care about a hermit.