I brought home 6 new sex link 1 month old chicks. We have had chickens for 18 years and have never seen this. One of the chicks who is a runt has pecked at one wing damaging 80% of the feathers and has a scab on his back. Breathing hard. I do not think they were raised with adults at the store. We have separated her and one friend from the others and they are all under a red warming light. Any ideas.? Thank you.