As the others have said damsels can be mean SOBs, and if there not your fav fish I would take them back to the LFS
for credit. I listened to a LFS
when I first got into the hobby and he said 7 yellow tailed damsels would be great in a 125 reef. so I got them and they would fight all the time with each other. The only time they got together was when i added a new fish, they would gang up on the new guy and beat them until they were dead. So I was limited to the fish i could get at first. 3 years later I still have 2 left and they do not bother any other fish now. Its tough when a 5$ fish kills a $25 fish.