Aqua Master Staple Fish Food, 22-Pound/Bag, Large Enriched nucelotide enhances koi immunity Balanced nutrition spurs growth Coated with Bacillus Subtilis natto to facilitate digestion and reduce water contamination; 1/4-Inch Enriched nucleotide enhances koi immunity Enriched nucleotide enhances koi immunity Balanced nutrition spurs growth Coated with bacillus subtilis natto to facilitate digestion and reduce water contamination; 1/4-Inch Coated with Bacillus Subtilis natto to facilitate digestion and reduce water contamination; 1/4-Inch