The 14 Day automatic API Holiday 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 litre aquarium for up to fourteen days.  The 14 Day automatic API Holiday Pyramid Fish Feeder will only dissolve in aquariums where water is properly circulated, use these feeders exclusively in filtered and aerated aquariums.  API Fish Food is formulated for a variety of popular fish such as cichlids, goldfish, tetra, betta, angelfish and more with high quality ingredients fish love such as algae, shrimp, worms and more.  Keep your fish healthy, happy and colourful with food that contains appropriate levels of nutrients as well as helps produce less waste, toxins and stress.