Use one packet of PraziCleanse per 20 gallons (76 L) PraziCleanse is a safe and effective anti-par treatment to help control your Aquarium. Effective against skin and gill flukes, tapeworms, flatworms, and turbellarians. This treatment is suitable for fresh and saltwater aquariums, and will not discolor the water. It does not harm plants, other invertebrates or uninfected fish. Do not use in systems with tube worms or feather dusters.