Short of holding Meet & Greets and just biting the bullet and letting them run together with plenty of places to run and hide (with you there to put a stop to any over-the-top bullying), there isn't a whole lot you can do. If you have a way to put the banties in the main pen first for a week or so, so they can kind of claim it as 'theirs' first, do that. You can also grab up your Head Roo and carry him around the banty pen for a few minutes (don't let him get loose) so that the banties can see him in 'their' area. Same goes for the banties, pick them up and tour the other pen with one of them under your arm. It'll give everyone a good look at each other and give you a little bit of a gauge as to how they will respond.

The banties may surprise you, they are not always automatically at the bottom of the pecking order! :)

Velvet ~:>

Thanks Velvet! I switched pens last night--chickens, at least mine, do not like change but I figured this would give each group familiarity with all of the territory. I'm going to leave it like this for a couple of days. Then one evening, I will "open the gates" so to speak and be there to intervene if necessary. I have never picked up either of our roosters and the banties cannot be caught. We are getting new chicks next week and those I will pick up every day to get them used to it. I'm learning.