I dont agree with this statement, triggers, just like any fish are oppertunity hunters, they will take what is easy, keep them well fed and they will have no reason to eat your shrimp. I have a 5"+ pink tail in my reef, shes doesnt eat anything other than frozen foods, does not move sand, does not herass her other tank mates, shes only aggressive when other fish are being aggressive and its more her showing her dominance and telling the other one to calm the hell down. Its of course a fish to fish basis, but I strongly believe aggression and bad eating habits can be dealt ith by providing a good diet.