My fish has torn or shredded fins. What can I do?

It sounds like your fish has fin or tail rot. You should test your water for high ammonia and nitrite levels. This can lead to the disease. Treat this as a bacterial infection. Your local store should have a medication available. If you have a UV clarifier, leave the ultraviolet light on to help prevent the spread of the disease. If you suspect your fish is ill, check out our guide on how to spot fish illnesses.