Lernex PRO is an improved version of Moreniccol Lernex, developed for the treatment against resistant worms (flukes) on ornamental fish.  Lernex PRO is based on the most recent scientific knowledge and contains high quality antihelminthics like Nitroscanate and Flubendazole, against which no resistance has been built up yet.  Therefore, Lernex PRO is effective against resistant skin flukes and Gill flukes.  The presence of these parasites can only be determined with a microscope.