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.