I've had pullets before with tail feathers like that... they always molt out... 

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We have 10 birds in a pen that consists of a 3ft x 6ft under coop space plus a 10ft x 6 ft attached run. I feel like they're a bit crowded but I haven't been able to expanded it yet. The original plan was that there would be 12 birds in an 8ft x 16ft run with attached coop by now but life happened.
Any advice on how to return my flock to a peaceful status would be appreciated.