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Fin rot is one of the most common and preventable diseases in aquarium fish. It can be a result of bacterial or fungal infection. The causes of fin rot are overcrowded tanks, outdated food, and overfeeding. The most common cause of fin rot is poor water quality, and low water temperatures. We can treat fin rot with phenoxyethanol, malachite green methylene blue,etc.Fin rot can be prevented with good water quality, feeding fresh food in small portions and maintaining constant water temperature. Keeping the tank from becoming cluttered will also help prevent fin rot.