NorthFin Marine Formula Premium Fish Food. NorthFin’s Marine Formula offers your marine fish maximum nutrition. A perfect balance of organic kelp and whole Antarctic krill meal allow your marine fish to easily digest the food while efficiently absorbing its nutrients and proteins. When food is fully absorbed less waste is produced, leading to a hygienic aquarium for your fish and corals. Available Pellet Size : 1, 2 mm Pellet type : Slow sinking pellets Recommended for: All types of saltwater, herbivore and omnivore fish. Available Sizes: 1 mm (20 g, 100 g, 250 g) 2 mm (100 g, 250 g)