Hello! I'm a new chicken owner, I bought two 5month old RIRs on Monday night from a backyard breeder. It's now Wednesday and I'm wondering if it's too late to buy a 3rd chicken from the same breeder and assume they will get along - or if I'll have to follow the introducing new chicken techniques and keep them separated for a while. Are there any breeds I should avoid when picking a 3rd chook to mix in well with the 2 RIRs? Thank you!