pecking orders

Hi, we got 10 brown laying hens when they were baby chicks on May 22 of this year. now that they are pretty much full grown we got a barred Rock rooster and put him in with them. They all get a long. they are on the outside of my shed in the fenced area but aren't allowed to go inside being I ordered 10 black sex links and 10 aracauna's in June as chicks, so they are a little younger then the ones before that. well now they have their feathers and have grown some (not fuzzy anymore) and I wanted to put them all together, so we opened up the shed and a coupld of the red hens went inside and kind of went after them and pecked at them, so then I just seperated them again being I didn't want to wake up in the morning and find some dead. I was just wondering if they get over this kind of thing and just leave them together, or how do I get them all used to eachother to where all of them can share the outside area and the shed?