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Fish Flex (Cephalexin) 500mg 100 Capsules fish popeye medication Continue for 5 to 10Fish Flex (Cephalexin) 500mg 100 Capsules Aquarium Safe Fish Antibiotic Fish Flex (Cephalexin) 500mg Capsules offer powerful, broad spectrum antibacterial protection for ornamental aquarium fish. Formulated with Cephalexin Monohydrate, a trusted fish antibiotic, Fish Flex targets both internal and external bacterial infections such as fin rot, ulcers, and gill disease. Safe for both freshwater and saltwater tanks, this fish antibiotic promotes rapid