We are new to raising chickens... We currently have 3 (2 week old) bantam chicks. We would like to add one more chick to our little flock. My husband would love to have a barred rock. Could having one standard pullet be an issue with bantams? We live in the 'burbs, so we'll need to rehome any Roos. Also, at what age can you start to tell a bantam's sex? Thank you!