The stress from the other fish chasing it can cause problems and cause the fish to get sick. You could try treating it but with the stress of being chased around it may not help. If there's females in the tank to they will cause aggression between the males.
I took the fish that has been chasing it and put it into a 10 gallon tank Gona leave it in there as a timeout lol not sure if it will get the idea but it should give the hurt fish some time to get better
How long should I keep the aggressive one in the small tank? These two have always latched onto each other's mouths no matter how much I move the tank around. I'm not sure if they are make or female. I'm not the best with telling the sex
I'd wait a few days to see if you notice any changes in the sick fish. If you're going to rearrange the stuff in the tank do it now so the other fish get use to the new layout before you put the aggressive fish back in.
I'm not sure how the healing process goes for a fish but it was very fussy. Chunk of fuzz is floating around off of it. Now you can see some blood on the area it looked like it was attacked. I'm hoping it's just healing.
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