Yea, Chromis are also called "Highlander Fish" -- There can be only one! LOL They literally beat each other up until there's only one left in most cases. Some are lucky to maintain their schools. I was not. I started off with 3 4 years ago...now I have 1. Ironically, the largest one was the 2nd to die because he got sick...so the one that survived is the smallest one that was bullied so bad in the beginning, that he was so small.