Fritz MetroCleanse is a safe and effective antibiotic and anti-parasitic treatment for several common protozoan and bacterial infections such as freshwater and saltwater Ich, Hexamita, and Oodinium, and is also effective against internal parasitic and bacterial infections. It can be used safely in a medicated food mix for use in systems containing invertebrates. Fritz MetroCleanse will not affect beneficial bacteria, and is non toxic even if overdosed. Effective Against Internal and External Parasitic Infections. Treats Ich, Hexamita, and Oodinium. Easy Packet Dosing System. Safe for Fresh and Saltwater Systems.