All types and ages of Koi The SaitekiTM Extreme Color is Carp Fish Food which complete and balance nutrition. Improve digestion of food and absorption of nutrients, immune system and promotes healthy skin, which faster color enhancer. Spirulina contains high levels of natural pigments including chlorophyll, carotenoids and phycocyanin which enhance fish coloration. Additionally carotenoids are potent antioxidants that helps strengthen the immune system. Astaxanthin is the carotenoid pigment that enhances the brilliant natural color especially red color in Carp fish.