Hi everyone!! I've got three chicks, about a "monthish" old, maybe a little more (5 or 6 weeks). I've got them in the brooder downstairs now, but bbaarrrhhh they stink. Real bad. I've been putting them outside a little during the day, in a big old dog crate, but my question is, when do they not need a heat lamp? Or what's a good rule of thumb?