Malachite Green is an effective medication used for the control of various external parasites of freshwater and marine fishes, When used as directed the medication will control or prevent the following common protozoan parasites: Ichthyophthinus Costra Chilodonella Ambiphyra Cryptocaryon (marine ich) Epistylis Oodinium and Trichodina, Malachite Green is also effective against common external fungai infections of fishes and eggs, SKU: RPS13622