chickens plucking each other's feathers?!?

I know it's been a long time sense we have written anything about our chickens, we finally published a new video on our YouTube channel, we've moved and we got everything set back up and the girls have been plucking each others feathers and we can't seem to get them to quit. If anyone has any suggestions or ideas please comment below or under the video. We have tried different things, like removing the girls that started the plucking, removing the rooster, adding more pearches, we removed the tarp from the top to make it seem like there is more room, we do plan on adding more space to their run this spring.

Thanks for reading 

Karen