Aquazole is an effective agent for parasite control. It is well tolerated by fish with little danger of over-dosing. Does not damage the filter bed. Effective against Cryptocarion, Hexamita, Ichthyophthirius and other external parasites. Although it can be used in salt water, Metronidazole would be the most suitable product. For use in freshwater showers or marine. Aquazole treat parasitic and bacterial infections.