Since your water parameters are ok, keep up the good work and keep a CLOSE eye on them.
There really is nothing you can do for the fish now anyway, except observe them and keep the water clean. You may want to put the fish with the bloody areas in a
QT for now, and get a GOOD antibiotic on Thursday; Melafix is only good for minor infections, not systemic ones like the kind that causes bleeding like that. Kanacyn would be a good choice. Do know the antibiotic will probably kill off the good bacteria. Thats why I suggest you put them into a
QT tank. You can treat them there, change the water if ammonia or nitrites show up, and you won't mess up the good bacteria in the main tank.
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