Well my chicks are getting old enough to be put with the adult birds, but the chicks can't have layers feed, as they're only around 12 weeks. I've heard that you can give your whole flock grower feed with oyster grit free choice, and the layers will get the calcium they need from the oyster grit, but the chicks won't mess with it and so it doesn't hurt them. Does this work? I'll probably put them all together in a week or two, when the layer feed runs out. Thanks!