Fin rot is generally a bacterial infection brought about by poor water conditions or physical abuse by tank mates. In cases involving aggressive tank mates or fin-nipping behavior, fin rot is a fairly common secondary infection. The most common symptoms of this disease include reddening or fraying of the fins "“ in extreme cases, the infection may lead to total destruction of the fin. The key to treating this disease is to halt its progression before the fins are totally destroyed. Remove any affected fish to a quarantine tank and begin treatment with an anti-bacterial medication. Performing frequent water changes to improve water quality in the tank is also an essential element in the treatment of this disease and, in some cases, a salt bath may also be effective.