That's great to hear your going to keep your hens 
Once you get on top of the mites you should be fine. Your hen with feathers missing on her neck could be experiencing molt at this time if year.
As for adding pics, are you on mobile or desktop version?

Once you get on top of the mites you should be fine. Your hen with feathers missing on her neck could be experiencing molt at this time if year.
As for adding pics, are you on mobile or desktop version?
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