FRITZ AQUATICS - Maracyn Oxy - 16 fl oz (473 ml)Fritz Maracyn Oxy is a quick and effective treatment for infections of true fungal infections on fish and eggs (whitish tufts of cotton like material) and some bacterial diseases. It slowly releases small amounts of a stabilized oxygen chlorine combination which, when used as directed, has an unusual ability to treat a wide variety of tropical fish diseases. Fungal infections are usually found at the site of an injury or recent attack from parasites.