API Patented pyramid-shaped feeder block contains nutritious slow-release pellets Our pyramid-shaped feeder block contains nutritious food pellets that are released slowly as the pyramid dissolves. Provides a superior nutrition source for aquarium fish when you’re away. One pyramid will feed 15 to 20 average-sized fish in a 10 gallon aquarium for up to 14 days. Meets the nutritional requirements of all aquarium fish (goldfish freshwater tropical and saltwater) Benefits: Automatically feeds your fish while you re away Feeds 15-20 average size fish up to 14 days Contains nutritious food pellets that are released slowly For fresh or saltwater fish