The problem is that my fish just finished moving, the stress, lowered their immune system, and i brought some new guppies that i notice had fin rot, now some of my guppies have it too.
One of my bettas was bought with fin rot in the medium stages. I did 50% daily water changes, adding Wardleys Promethyasul at 1/3 of the recommended dose and salt and it cleared up in about 2 weeks.
It looks like some fish are ..healing, i cannot tell the difference between some of them, they drive me nuts looking at them. I dont know if they are healing themselves or the meds are helping them, but the case looks like it's getting better, funny how the cories are all fine