I'm getting two Mille d'Uccles that are 5 weeks old. Within a week I'll be getting two Serama hens that are a year old. I plan on keeping them together once the d'Uccles are old enough, but don't know what to feed them all once they're together! I want them as pets only, and eggs don't matter. So does this mean I have to feed layer feed? Or can they all be fed all flock once the younger ones are off the grower stuff?