15 5 week old Cornish X chicks--do you think they'd be OK down to about 55 degrees at night? Some look pretty much fully feathered and some still have minimally feathered spots along their bottoms. It's been much colder and I've left the (gradually moved up) heat lamp on, but finally supposed to warm up tomorrow and I'd love to get it out of there. They do still hang out underneath it but they'll drift off in little groups too.