sera GVG-mix marin is an Iodine-rich flake food with tasty morsels for all saltwater fish. These fish need much more iodine and other minerals than freshwater fish. Sera GVG-mix marin consists of 80 % special flakes made from marine algae, ground krill and plankton. 20 % are FD bloodworms, Daphnia and Artemia shrimps. sera marin is excellent for providing marine fish with iodine and other essential minerals as well as prevention of thyroid gland diseases.Do you have questions about this article ?