I have 5 hens and they are around 4 months old. I am currently giving them Grow mash, chicken scratch, water of course, all the greens from the garden they can eat. The greens include turnip tops, carrot tops, lettuce, radish tops, spinach. They also eat all the bugs they can catch in the yard for a couple hours a day. Am I missing anything?? I keep reading about grit and am not sure if I'm meeting their needs. They are really big and very healthy looking. They seem happy but I just want to make sure. Thanks