Ultra Cure PX is a revolutionary way to treat internal parasites in both freshwater and saltwater fish. Scientifically formulated with Metronidazole and Praziquantel, Ultra Cure PX helps control a variety of parasites such as intestinal worms, nematodes, tapeworms, flagellates, fish heartworms and Hexamita. This innovative Gel-Teknology directly treats infected fish and helps prevent secondary infections which can often occur during periods of infestations. Ultra Cure PX contains fish pheromones to entice and enhance feeding behavior without clouding the aquarium water. Ultra Cure PX is safe for all saltwater and freshwater fish and especially useful with catfish, cichlids, goldfish and other bottom feeders.