Chromis sick or injured
Hi, I have had my tank setup for a few weeks now and added 2 Green Chromis fish 8 days ago. For a few days they got along great, schooling together, but after a few days the slightly bigger chromis began becoming increasingly belligerent towards the other fish. The other fish now has brown gills and therefore, I just isolated the aggressor. The fish is eating fine and isn't rubbing up against anything, and the aggressor isn't displaying the same symptoms. Is that just injuries? if so, what should i do with the aggressor?
I have a 30 gallon tank.