A triple acting treatment for saltwater ich and other parasites. Not some rotten sugar-vinegar concoction that claims to "make ich go dormant". Not just a pepper sauce, RxP treats multiple stages. Thin consistency - not a barbecue gravy that pollutes the aquarium Highly effective, works better than copper, yet leaves no residual toxic metals after treatment! Contains only natural ingredients. Can be used with most invertebrates (with caution), if you have strong biological filtration, such as a sufficiently sized wet dry filter, and a properly adjusted protein skimmer (the hobbyist much take care since marine parasites are invertebrates â€“ RxP will stress other invertebrates â€“ read all directions below!). Contains no copper or carcinogenic dyes. Can be used with Sharks, Rays and scaleless fish. Does not cause lateral line disease, like metal based treatments do! An 8 oz. bottle will treat a 50 gallon tank for one full treatment.