I have 11x 18 week old pullets living in a large run/coop. I have 3x 2 year old hens who have been free ranging during the day and have been shut into the run with a tarp/roost overnight while the pullets are shut in the coop. For 6 weeks they lived together divided by a wire fence. I tried to put one hen in and within 5 seconds she had violently plucked major feathers out of the pullets (who are pretty big). I know of the idea: put them together at night, they wake up happy in the morning, however, my big concern is Polly-my polish. She can't see anything. I am so afraid that at dawn she will have no chance. i feel like I need to be there to mediate to some degree. I must integrate them soon. Should I let them all outside to free range for a day (The pullets have never done this) I run a preschool and can't have chicken poop everywhere. I reopen in 3 weeks so trying to figure this out. All of the chickens still see each other as the hens peck at the pullets through the wire. Any advice appreciated. Thank you.