In their natural coral reef environment, Marine Butterfly fish, Angels, Tangs, and many other fish feed by picking throughout the day on surfaces of coral heads and live rocks. The FEEDING FRENZY Grid Feeding Clip helps to duplicate natural feeding behavior by holding food intact and prolonging the feeding process so fish are not forced to eat their entire days food in a five-minute rush. Product Features Underwater feeding aid for shy fish. Firmly grips or holds a defrosted cube of gel-based Frozen Formula Foods. Excellent for butterflies and other picky feeders. Recommended for use with Frozen Formula Foods and Seaweed Selects.