My Multis don't even seem to notice the shrimp. I put 8 shrimp in with them just to see what would happen and all 8 are still in there. I've even noticed a few times that there will be a shrimp and a fish in the shell together paying no mind to each other. However, my Multis are just juveniles so that could be why. Even if that's the case, I'm hoping that from "growing up" with the shrimp they will realize once they're bigger that the shrimp are no harm. We shall see. Here's a picture of my Multis with a RCS:
