FINROT
finrot is typically an infection that requires two steps.
One, find out why u have finrot by checking the water chemistry and back tracking to determine what stress caused it.
Two, treat with the approiate remedy. Melafix can be effective if the infection is caught in the early stages and you correct the cause of the finrot.
generally, a double dose of salt, or a salt bath will help, followed by a medicinal treatment of ...
OTC - Oxytetracycline - use caution as OTC disrupts the biological aspect of your aquarium.
Maracyn is also effective, but slow to see results.
EM, or Myacin, or Kanacyn, tend to be the better of most, but see whats available at yer LFS.
Good luck.
Exodon.