Fritz MetroCleanse is a metronidazole treatment for some of the toughest protozoan and internal infections, including freshwater and saltwater Ich, Hexamita, and Oodinium, plus internal parasitic and bacterial issues. It can be dosed straight into the water or mixed into food, and it will not harm your biological filter. Explore more fish medication.Features Active ingredient metronidazole for protozoan and internal infections Treats freshwater and saltwater Ich, Hexamita, and Oodinium Effective against internal parasites and some bacterial infections Will not harm beneficial nitrifying bacteria, even if overdosed Can be used in a medicated food mix, handy around invertebrates Choose Your Size 10-count packets for smaller tanks 20-count packets for larger systems and better value How to Use Broadcast method: 1 packet per 20 gallons (76 L) every 48 hours, up to ten treatments Feeding method: mix 1 packet per tablespoon of food and feed daily until symptoms clear or up to three weeks Remove with activated carbon once treatment is complete Specifications Brand Fritz Type Medication (metronidazole) Water Type Freshwater and saltwater Sizes 10-count and 20-count packets Treats Ich, Hexamita, Oodinium, internal parasites Origin Made in USA Recommended Pairings Strengthen the slime coat with ParaShield Rebuild the biofilter after treatment with FritzZyme Trace Browse all medication Frequently Asked QuestionsWill it crash my cycle?No, it will not harm beneficial nitrifying bacteria, even if overdosed.Can I feed it?Yes, mix one packet per tablespoon of food to target internal parasites.How do I remove it?Add activated carbon after the treatment course.