Professional food for perfect colors, ideal growth and healthy fish Due to a particularly high amount of Spirulina carotene and Haematococcus algae rich in astaxanthene, sera KOI Professional Spirulina Color Food ensures unique color depth along with clear separation of the color zones and silky gloss. White patterns do not become unsightly yellow but remain bright white. High quality protein ensures balanced and healthy growth. The unique co-extrusion process allows combining differently treated ingredients. The ring contains high quality natural ingredients such as Spirulina and Haematococcus for unique colors and an appropriate diet. The core consists, among others, of essential vitamins, minerals and trace elements for healthy growth and a strong immune system. sera KOI Professional Spirulina Color Food can be fed throughout the year above 8°C (46°F) water temperature. sera Koi Professional – the first co-extruded food for Koi 1. Ring Food blend optimized for every season, for a nutrition according to the natural requirements of Koi. 2. Core Contains the sera Vital Immue Protect Formula, manufactured in a prticularly gente low temperature process.