Trouble with damsel fish with others in the tank
I have recently been noticing some trouble with my damsel fish. When I first acquired the tank in came with 2 clown fish, 1 green chromis, and 1 yellow tail damsel. So as the time went forward after the first two weeks I went ahead an added another damsel and 2 more chromis into the tank.
I noticed over time that the two damsels would gang up and harass the two new chromis, but not the one that was in the tank first. They have recently caused one of the chromis to die and are not just focusing on the smaller chromis.
I have recently got a spotbreast angel and a cleaner wrasse for the tank and they seem to be doing fine, but I noticed that the damsels where being very territorial towards the fish. At first when I added the fish to the tank the tommy tang was also very aggressive towards the angel, but the wrasse was always next to her to defend her. But the tangs aggression seemed to have passed after the first night of them being in the tank, and has actually become for social with the rest of the fish. But the damsels are still being overly aggressive.
I came home from work tonight to find the wrasse dead with a wound on its side. I suspect that it was the damsels. So should I just get rid of the damsels or is there a method I can try to lower there aggression?