I'm new to keeping chickens and love this website. it's been very helpful to a newbie. I have four bantams and my fave the Rhode Island Red (as seen when healthy in my profile pic) is now looking rather ill. She's lost a lot of weight has a pale face and comb and is pulling her neck feathers out. There were definitely a number of red mites in their coop so after battling against them for a couple of weeks I gave up and bought a new plastic easy clean coop which I've been cleaning every three days as well as dusting with DE. All birds dusted every 10 days with DE too. No sign of mites in coop or on birds now but still no real improvement in the sick chucky. The other three birds don't seem to be affected. I've dewormed the mini flock using flubenvet. She seems to be eating and drinking well and is walking around as per normal but she looks pale and has pulled a lot of feathers out around her neck. She also has yellow skin where she's pulled feathers out, not sure if that's normal? I've attached a pic of her if anyone has any other ideas I could try?