Hikari Gold is a daily, color enhancing koi diet that aids in the development of brilliant red and orange coloration. Hikari Excel rich in spirulina and wheat germ, provides enhanced coloration while readying your koi for reproduction. Hikari Spirulina provides excellent coloration of the red and orange areas of your koi while creating a noticeable richness in the white areas as well. Our Saki-Hikari Color Enhancing Diet is what breeders choose and is part of our professional lineup for koi.