Nocturnal fish and bottom feeders will love this all natural, hormone-free formula from New Life. Non-polluting, sinking wafers keep their form, for 24 hours so that your nocturnal fish and bottom feeders can feed at their leisure. Also good for grazing fishes and fry. Spectrum fish foods naturally enhance the full spectrum of coloration in saltwater and freshwater fish. Balanced diet formulated for jumbo aquarium fish includes krill and fish meal protein for easy digestibility, and is fortified with immune-system boosting vitamins.