I got a a yellow tail damsel about 4 days ago as my first fish to put in my tank, he seemed to be doing very well so today I got a 2nd one from the same group from the store because I know they like groups!-- The first one goes after the 2nd one, I have heard that damsels are aggressive and can easily become territorial but that the yellow tailed damsel is one of the least aggressive-- do you think this will stop and they will get along after a little while or not? Anything I can do? I might add a 3rd if this one works out!