I actually just ditched mine, he was fine up until he molted, then he went nuts and ate two small clowns and kept bother my nem. I decided he had to go. That said he was a model citizen for almost a year. I guess it depends on the shrimp you get!!
My coral banded is nasty. I've never seen him bother corals, but he immediately kills snails and has killed a damsel, not to mention he tries to attack me anytime I put my hand in the tank.