sera KOI Professional - the first co-extruded Koi feed Ring: Seasonally optimized feed mix for a diet naturally needed by Koi. Core: Contains the sera Vital Immune Protect formula, produced in the particularly gentle low-temperature process. Optimum fatty acid composition with omega-3 fatty acids. Balanced carbohydrate content, rich in high-quality fish protein. For high usability, less water pollution and clear water