FUJI KOI is an excellent color enhances diet for hobbyists who want their koi fish to keep in the best condition during the warm season, especially in the koi show. This outstanding die promotes exceptional coloration with its nature colour enhance ingredient: pure culture spirulina and astaxanthin. Want a championed koi fish. Feature: Abundance of Spirulina, Krill meal, well balanced vitamins and other nutrients help to enhance the colour of koi distinctly and vividly.