Vacation Pyramid Fish Feeder Recommended for: fresh or saltwater fish API has been an industry leader in fish care, nutrition, treatments, testing and pond products for over 50 years, giving them a keen insight into your aquarium and its needs - making them the clear choice for fish enthusiasts around the world. APIs pyramid-shaped vacation fish feeder contains nutritious food pellets that are released slowly as the pyramid dissolves in your tanks water, providing a superior source of nutrition for fish while youre away. Feeding 15-20 average-size fish up to 14 days, its an easy way to ensure your fish are swimming fit when you get back from your holiday.