I have 12 week old ducks and chicks. As the baby's are the same size as the smaller hens in my adult flock (and quarantine is complete)I've started mixing them in with flock. They're now mingle with the flock in the pen all day and are locked in a cage inside the coop at night. During the day they have acsess to layer pellets and all the fruit, veg and grass available to the adults, at night they get grower food in the cage with them. Will the 50/50 diet of layer and grower cause health issues?