I am brand new this year to raising chickens, and I am oh-so excited! I am getting 10 chicks the week of April 11 - 3 black Australorps, 3 Buff Orpingtons, 3 Speckled Sussex, and 1 White Plymouth Rock. I really wanted Dominique chicks, too, but the hatchery I used were out of them that week. A local breeder in the area that I live had posted some Dominique's on Craigslist that are 1 week old, so will be approximately 2+ weeks old when my "flock" arrives. Would this be a problem, introducing smaller chicks to 2 week old chicks?