New to chickens, family gave us 3 chicks. They turned out to be 2 roosters 1 hen. We really wanted 2 hens 1 rooster. My wife read it was difficult to introduce new stock as the disease factor. Plus we don’t need 2 roosters. They are 9 weeks old….until I get rid of one, do I separate from the pullet? They seem to gang up on her.