Tetra® Goldfish Flakes are a nutritionally complete daily diet for all goldfish and small koi. Ideal for use in aquariums and outdoors in small ponds too. This scientifically developed mix of highly nutritious ingredients plus vitamins, minerals and trace elements will enhance your fish’s naturally brilliant colors. Includes patented, health-enhancing ProCare formula to help support your fish’s immune system for optimal health and long life.