I think my fish may have fin rot, the fins are starting to get jagged and slowly coming off. They had fin rot a while ago when I think my tank got columnaris and a lot of their fins are messed up but a lot of it grew back and it's been a whine since then. But how do you deal with it? I dont have money at the moment to buy medicine for the fin rot but I been reading that water changes help a lot? I do have aquarium salt would that help? I also checked my tank readings and everything was good except the nitrates were a little high.