I just got some day old Columbia Rocks chicks (10). The local feed store was giving them away free when you buy a bag of chick starter feed. I went to the feed store because I'm getting a shipment of day old Sex Link checks (10) in about 3 days. Now that I have the free chicks plus the mail order chicks are coming soon I'm worried the first group of chicks may be too old to mix the new ones in with under the same brooder. They will be almost a week old when the second bunch arrive. Can I still but them all in the same brooder or should I build a second brooder. I was hoping to keep them all together thinking it would be easier if they grow up together then introducing them to each other later on as I only have one large coop so the flock has to roost together sooner or later.