The 14-Day automatic API vacation Pyramid Fish Feeder contains nutritious food pellets that are released slowly, as the pyramid dissolves. It is made with superior nutritional ingredients to feed all tropical, coldwater and marine aquarium fish while you're away for up to fourteen days. It includes natural ingredients to meet nutritional requirements of all aquarium fish. One pyramid feeds 15-20 average-sized fish in a 37-liter aquarium for up to fourteen days.