Parasitic and Protozoan infestations are no match for Clout. This effective medication treats ich, hydra, leeches, planaria, hexamita, epistylis, trichodina, tetrahymena, body fungus, argulus(louse), Fish flukes and anchor worms in your aquarium. One tablet treats 10 gallons. Clout is a favorite parasite cure of most hobbyists and professionals. Also helpful if fish show signs of listlessness, rapid breathing, or excess mucus production. Should not damage plants or algae. Does not affect pH and is safe for biological systems. Not for use with scaleless fish, aquariums with ornamental worms(featherdusters)or invertebrates.