The Zeigler Koi Fancier is a complete color enhancing diet for Koi and Goldfish and also contains stable vitamin C and Brewers yeast for healthy fin, gil, and tissue development. All handle bags are nitrogen flushed to preserve freshness. This high quality diet has marine protein to increase palatability, digestibility, and reduces waste. The Zeigler Pond Diet has more nutrient dense pellets than competitors. (Pellet Size - 3/16")