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A 100% organic solution to help prevent fish diseases caused by ich, fungus, protozoans, and dinoflagellates. Safe for all freshwater and saltwater aquariums, including reef and live rock aquariums. Also safe for ornamental ponds use. Non-toxic to all biological filters, fishes, amphibians, and turtles. As a preventative, add one teaspoonful of Prevent Ich for every 10 gallons of water. If ich is present, add one teaspoonful of Prevent Ich for every 10 gallons of water and repeat dosage daily for one week, or longer if needed. 16 fl. oz. container treats up to 96 gallons.Active ingredients include 5% multiple natural herbals containing Naphthoquinone.