I'm glad everyone is looking better. As Lupin said, just keep an eye on it. If you feel it would help, you can take a photo of the affected area every couple of days so that you can compare the area and make sure it's not getting worse. Sometimes, when you look at a fish all day, it starts to get difficult to tell! If you do think it's getting worse, it would be the time to medicate in a QT tank, but hopefully, the fish will fight it off for himself. They're remarkable in what they can do if we do our part to provide the best conditions.
Also, did you happen to see my suggestion about somehow getting more food to your little guys without the big guys eating so much? I'm not sure what you feed, so it might not be possible, but it would help preserve water quality, for sure, while still letting the little guys get plenty to eat.