Its a boy, your only going to get a 99% chance of a girl if it's a sexlink. All other breeds are 90%. I would not suggest putting only one chicken in with them. It will be alone until it's ready to go outside and they'll beat it up. If you could find another that was the same age you would have better luck.
He'll have to be at a new home by the end of today before animal control is knocking on my door. Thank you to everyone who replied.
