sorry to hear that. been there. It's like a Mutual of Omaha Wild Kingdom thing.
Currently, I have a banded coral shrimp along side 2 camelback shrimp, 3 emeralds, 2 porcelain crabs, 1 fire shrimp and one pistol shrimp, 2 pithy crabs and various other hermits. All living in peace for the last 12 mo. In fact the camelbacks hang out in the same grotto as the coral banded and they don't seem to notice each other.
that said, it is a 100gallon tank and perhaps they have plenty of elbow room and not a lot of competition for food (as others have said).
could also be that you coral banded was/is just a jerk. that happens.