Hikari Metro+™ Fish Medication Hikari Metro+™ is a professional-strength powdered fish medication formulated with metronidazole to treat a variety of protozoan and internal infections in freshwater, saltwater, and pond fish. Designed for both bath treatments and medicated food, Metro+™ provides a versatile and highly effective solution for some of the most challenging fish diseases, including Hole-in-the-Head (HITH) and Head and Lateral Line Erosion (HLLE). Unlike many metronidazole medications, Metro+™ also contains a proprietary slime coat replacer that helps support healing of damaged skin and scales while treatment is underway. Whether you're caring for discus, cichlids, tangs, angelfish, or other freshwater and marine species, Metro+™ delivers targeted treatment while remaining gentle on fish when used as directed. Key Benefits Contains metronidazole, a proven anti-protozoal medication Effective against Hole-in-the-Head (HITH) and HLLE Can be used as a bath treatment or mixed with food for internal infections Includes a synthetic slime coat replacer to support healing Suitable for freshwater, saltwater, and pond fish Works systemically to target internal infections Easy-to-dose powdered formula Safe for a wide variety of aquarium fish when used as directed Treats Common Fish Diseases Metro+™ is commonly used to help treat: Hole-in-the-Head Disease (HITH) Head and Lateral Line Erosion (HLLE) Hexamita and Spironucleus infections Certain metronidazole-susceptible protozoan infections Internal protozoan infections when administered in food It may also be used in certain cases involving freshwater ich and marine cryptocaryon (marine ich), although Hikari recommends disease-specific medications such as Ich-X® when appropriate. Flexible Treatment Options Metro+™ can be administered in two ways: Bath Treatment: Ideal for external protozoan infections and fish showing visible symptoms of HITH or HLLE. Medicated Food: Mix with fish food to deliver treatment directly for internal infections while reducing medication exposure to the aquarium. Ideal For Metro+™ is frequently used with: Discus Oscars Angelfish African and South American Cichlids Tangs Marine Angelfish Other freshwater, marine, and pond fish susceptible to protozoan infections Product Features Active ingredient: Metronidazole Powder formulation Suitable for freshwater, saltwater, and pond aquariums Can be used as a bath treatment or medicated food Includes synthetic slime coat replacement technology Professional-strength formula from Hikari Aquarium Solutions® Frequently Searched Keywords Hikari Metro+, Metro Plus fish medication, metronidazole fish treatment, Hole in the Head treatment, HLLE treatment, Hexamita treatment, discus medication, cichlid medication, marine fish medication, freshwater fish medication, aquarium parasite treatment, fish internal parasite medication, metronidazole aquarium treatment, Hikari fish medicine, Metro+ powder.