Our chicks are 9 days old. We have food grade items: 10 Grain Bulger Wheat Corn Grits Cracked Wheat Flax Meal Flax Seed Hulled Millet Mung Bean Sprouts Pea Sprouts Scottish Oatmeal Wheat Bran Rice Chex Corn Chex Corn Flakes Cream of Wheat Can they eat any of these in some form and do we need to add cage bird grit? I can run up to the 24-hour Walmart for the grit. THANK YOU!!!!