i have two unknown breed (well ones a brahma) bantam chicks, which are around one week old. i will be receiving 3 buff orp chicks in 2 to 3 weeks, and i was wondering once the orps are around 3 weeks old, would it be ok to mix the two, or will i have to wait longer? i know that orps are really docile and i dont want them to get picked on too much. TIA.