I also have 2 yellow tail damsels that I kept, They are not as bad as the dominos and 3 stripe were. They harrass some fish a little when they are first introduced, but usually not so bad, and its only certain fish. After I gave my dominos and three stripe to my buddy, I had the 2 yellow tails left, and I added a pair of snowflake clowns, the damsels never bothered them, I then added a strawberry basslet, and they didnt bother it, then added a six line wrasse, they tormented the wrasse for about 48hrs until they finally stopped. I thought I was going to have to intervene before the wrasse got killed, but they let up and now everythings fine.