I'm worried. I haven't been feeding them grit. I didn't know I needed to until today. They've had mealworms and other treats (nothing hard, but they had oatmeal that was mixed in with the mealworms, and shredded cheese, and they've been outside to munch on grass a few times when it hasn't been raining). Are they going to be ok? Should I run out and get some grit for them today? How do you feed them grit? Just put it in with their food or what?