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An all-in-one, non-antibiotic, treatment that attacks a broad range of external fish diesases: bacterial, fungal, viral and parasitic. Extremely effective agains fungus in ick. Uses the powerful oxidizing action of HaloShield(reg) to attack and destroy disease-causing microorganisms.Offered in convenient, pre-scored, dissolving tables to take the guesswork out of dosage.For use in freshwater aquariums.Each 1/4 tablet treats 2.5 U.S. gallons.Active ingredients: 1-chloro-2,2,5,5-tetramethyl-4-imidazolidinone.Remove filter carbon and turn of UV sterilizer before use.