Torn or shredded fins are usually a result of aggressive chasing and nipping behavior in your aquarium. There are many solutions to the problem, including removing the aggressor or the victim to another tank, or re-arranging the decorations to disturb the established territories in your aquarium. It is possible that the torn fins are attributed to a bacterial infection in this situation torn fins are usually accompanied by red or white blotches. Treatments are available at Big Al’s. Follow the directions on the medication and follow proper aquarium husbandry practices to avoid a relapse.