I haven't bought new chicks in a few years. My flock is down to10. They have an 80 sq ft coop with a 160 sq ft run and are allowed to free range on a few acres almost every day unless the weather is dreadful. I have ordered 15 new chicks. I plan to make a brooding section under the poop board in the coop. The poop board is about 3.5 feet off the ground and the square footage underneath is more than enough room for a brooding area. In fact, I may only use a portion of this area. My thoughts are the chicks will be in close proximity to the established hens as they mature. What problems might I encounter during their maturation? And, when they are ready to leave the brooder, what problems might I encounter then? My thoughts are they should all be pretty used to each other by the time I am ready to physically mix them together, but I want to hear what others have to say who may have tried this. Thanks.