Blue Chromis Question

[jbt24]

My two chromis always swin together and dont really ever hide and now one is hiding in the rocks and the other is out most of the time. My question would be what would cause them to do this?

 

[xyzpdq0121]

One has turned dominant over the other...

 

[ericmcj31]

yeah-one is getting bullied; I started with a school of about 7 or so-now I'm down to like 3 or 4--they eventually will dominate one another and kill the weaker ones off

 

[bobz]

I noticed the same thing in my 70G. I had to remove two from a group of five that were being beaten down. Recently, one has risen above the others and is dominating the tank and harassing the other one as well. I'm hoping that a move from the 70G to the 210G may even things out again. These guys can be very aggressive towards each other...after all they are in the damsel family (i think).