I have a 30 gallon with a yellow tail damsel and 2 clown fish. I've tried to add 2 royal grammas at separate times and they both died after a week. Then my last try was with a fire fish it died after 3 days. It seems to be the damsel stressing the fish out. My damsel tried my clown fish when I first added them, but when my clowns put a whoop *** on him he's mister best friend with them. I was wondering if I could get some input on a type a fish I could add that can defend itself against my damsel. I will appreciate any suggestions. Thank you