Fritz Maracyn Aquarium Medication by Fritz Aquatics treats and controls a number of pathogenic bacteria that can cause serious disease and even death in aquarium fish. This safe fast-acting powder formula is non-toxic to invertebrates and safe for use in fresh and marine aquariums. Provides relief from bacterial infections Treats body fungus gill disease and popeye Fast dissolving powder medication Fritz Maracyn can be used in freshwater and saltwater aquariums Fritz Maracyn is a specially compounded broad-spectrum treatment which has been shown to be effective against a number of pathogenic bacteria associated with ornamental fish disease. It was developed for complete but gradual dissolution in water. It is primarily effective against gram-positive pathogenic organisms. Symptoms of clamped fins swollen eyes heavy or rapid breathing patchy coloration change in swimming behavior or corner hiding can be signs of possible bacterial infection. All suspected bacterial infections should be treated immediat