Fish Pen 500mg Capsules for Aquarium Fish – 30 Count – Water Care SupportFish Pen 500mg capsules are commonly used by aquarium owners to help manage bacterial related conditions in fish. This product is often selected for supporting fish health and maintaining a balanced aquarium environment. Fish Pen is frequently used in the care of fish experiencing symptoms associated with: Fin rot Tail rot Flexibacter infections Red sores or ulcers General bacterial conditions Maintaining proper water quality and early treatment is