My babies are 3 days old. Tonite I gave them a little bit of egg yolk, they also hunted down and went crazy fighting over a huge ant. Do I need to give them grit for these few little snacks? Or only when they eat grasses and grains? Would it hurt them if I gave them a little bit? They currently eat medicated chick starter crumbles only. Thanks!! Gosh, they are doing soooo good!! And they are so sweet!