Aqua Master Staple Fish Food, 11-Pound Bag, Small Enriched nucelotide enhances koi immunity Balanced nutrition spurs growth Coated with Bacillus Subtilis natto to facilitate digestion and reduce water contamination 4 Bags/carton; 3.5-4.0 millimeter Enriched nucleotide enhances koi immunity Balanced nutrition spurs growth Coated with bacillus subtilis natto to facilitate digestion and reduce water contamination 4 bags/carton; 3.5-4.0 millimeter Coated with Bacillus Subtilis natto to facilitate digestion and reduce water contamination