Feed your young pond fish a diet formulated for growth with Tetra Pond Koi Growth High Protein Koi & Goldfish Food. Protein and vitamin C are essential to healthy growth and development and longevity. Tetra Pond Koi Growth High Protein Koi & Goldfish Food is formulated to promote growth and fortified with vitamin C, a valuable antioxidant that fights disease. This pelleted formula softens quickly in the water for easier digestion and less waste.