I have some eggs in the incubator that are due to hatch on the 24th. It is my birthday on the 29th and my fiance wanted to surprise me with some chicks (as I had a bad run this year with incubator failures, weak chicks, and the two I did get and had survive were gotten by predators while I was out of town in August--my mom was checking on the critters,but the quiet few days (dog inside, no kids running around outside, etc..) seems to attract predators). So my fiance ordered me some baby chicks (15 of them), which I got notification that they will be shipped out on the 23rd to arrive the 24th or 25th. So they will be a couple of days older than my hatch-lings. Can I put the two groups together (assuming I get a few chicks from the 10 eggs I have incubating, 6 of which are definitely good so far) in a single brooder or should I do separate brooders? Is there risk of disease at such a young age? Will the slightly older ones beat up on the ones hatched here if they are a couple of days younger? If I do separate brooders initially, when should I put them together? Sorry for all the questions, I just don't want to lose any more feathered babies this year.