So my 18 wk olds are finally laying..YEAH!! Bad news...soft shells and they are breaking. Some are laying in their nest boxes, others up on their roost and outside on the ground. I know the solution is to give them oyster shell and laying pellets, but I have a mixed group all living under one roof and I can't control who eats what. They range in age from 5 weeks to 18 wks. I can put the oyster shell in a separate feeding dish, but have read not to let the younger chicks eat oyster shell or laying pellets. What do other people do with a mixed group?