Vitamin C has been shown to enhance the immune system of fishes and invertebrates, as well as facilitate the metabolism of fatty acids, and stimulate the production of connective tissue, such as that damaged by head and lateral line erosion, coral propagation, bacterial and parasitic infestations, and wounds. Marine. C helps correct vitamin C deficiencies in ornamental marine organisms. Can be used as a daily supplement or when treating damaged/sick fishes and invertebrates, although not a medication. Particularly useful when fragmenting and propagating hard and soft corals.