NorthFin Marine Formula 1 mm Sinking Pellets Fish Food, 20-g bag; Help your finned friend dazzle from the inside out with the NorthFin Marine Formula 1 mm Sinking Pellets Fish Food. This fish food is specially crafted for saltwater fish to help brighten their scales and promote their overall health. This nutritious recipe is full of protein, amino acids, vitamins and minerals. Plus, it’s formulated any fillers, hormones or artificial colors so you can feel good about giving it. It even promotes an easy digestion for your scaly sidekick.