I am currently feeding 12 laying hens and 29 10 week old chicks. I am feeding the hens layer crumbles and I am feeding the 10 week Olds a medicated starter/grower crumble. I am interested in switching them all over to a "all flock" feed and providing oyster she'll for the adult birds. What is everyone's opinion on this? Is there anything else I would need to supplement either side with if I were to do this?