I am wondering about moving the chicks outside. They are 4 weeks old and are beginning to pick at each others tail feathers while in the brooder, a 50 gal rubbermaid bin for 9 chicks. the weather here in DAllas is nice, day temps are getting in the 70's to 80 but the night goes down to about 55. If I do move them outside will they need a light for heat? And if so, do I need to put something over the reflector part so they dont fly up to it & get burned? right now I have them in my attached garage with no heat source. Any ideas? thanks!