I have 26 New Hampshire Reds, they'll be 4 weeks old on Monday. They've all been good, healthy, happy chicks, but tonight when I was putting feed and fresh water into their cage (they're in a big dog cage), I saw one of my girls had a bloody back end. It appears she is missing tail feathers, and that's where all the blood is. After about 20 minutes, I was able to catch her, I put her in a separate cage but now they're all pecking another one. I understand they peck, at what point do I need to be worried that they've gone too far? The one I split out, I do not have a heat lamp for, but it was 91 here today, she's in a cat cage, inside a big dog cage, inside my garage, do you think she'll be warm enough? They're pretty well feathered out, and I think it'll be in the 70s outside tonight, so maybe 5 degrees warmer in my garage. I appreciate any feedback. I've been very lucky with my chicks and am not prepared to lose one now! Thanks.