DE GREEN-Pro  is a 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: Ichthyophthirius (fresh water ich) , costra , Chilodonella , Ambiphyra , Cryptocaryon irritans ( marine ich ) , Epistylis , Oodinium and Trichodona