Not sure if its because they were put in at different time.
Right now I only have 2, the 2 new ones (One has been beat up a bit).
The old one started bullying the new ones right away, but then they seemed to get along and swim together. They are all small so I figured they would get along, since the other has not been in my tank long. I figured I was going to be missing one of the new ones at some point, but it looks like the 2 ganged up on the one and they are the only ones I have left today. No sign of the other.
So I guess im going to stick with what I have, I might end up with 1 again but well see
Reef math is fun, isn't it.