I have had a few instances where certain fish in my saltwater aquarium did not get along, and there didn’t seem like there was going to be anything that I could do to convince them otherwise. I suppose it’s not like cats or dogs where they can eventually work out their differences and eventually become best buddies. Fish are different. It seems like if a fish is territorial for some reason, that it will simply stay that way. It seems to work best for me to just separate any fish that have problems with each other and not really try any other alternatives at this point.