Anthias establishing dominance! *video*

I would dose some vitamin C into the tank water. They can absorb it directly into their bloodstream through their gills. Those fish have to be stressed and vitamin C will help support their immune system during the process. Even after you stop seeing physical aggression, there may be some dirty looks you won't see and chronic stress can kill your fish. Vitamin C is the nectar of the gods.

 

Ohhh ok i will try. I have been giving them selcon 2 times a week.

 

Selcon is nice, but it's not the same as Vitamin C where the immune system is concerned. I believe Selcon has stabilized vitamin C, but if any of that reaches your fish's GI tact to be absorbed, I'd be amazed. They can receive much better doses through dosing the water itself.