Hi, I have a 4 hen and two rooster flock. There about 4.5 months but their Icelandic so don’t lay eggs yet. I am going to get three more hens to balance the ratio a bit and probably get rid of another rooster. The new hens are between 6-8 weeks old. So I am wondering do I just stick the new hens in with the rest of the flock? Or will that cause bullying?