Blue Ridge Platinum Pro Fish Food 50 lb Blue Ridge Platinum Pro is a professional, fish meal-based diet formulated for discerning koi keepers that want the very best for their fish. It contains everything needed to keep your fish in top show condition including top quality protein, carbohydrates and amino acids. It contains proven color enhancers Spirulina and Canthaxanthin for superior color enhancement. Also includes Primilac, a probiotic immune stimulant designed to protect koi from sickness and disease.