Okay, this may be a silly question... Does it make a difference if I keep my 1 week old chicks in the brooder (aka, dog crate) or if I move em to a chicken tractor? I will still keep the light on em so they don't get cold. They will have more room (I guess they will have to move under the light if they get cold) and will be on grass instead of shavings. whataya think?