I have a metal human baby tub with sand in my chicken's run. Last year I read metal can pose problems in the winter cold to their feet stepping on cold metal/freezing. I'm in GA with mild winters, but a lot of days will go below freezing. Do you think I should remove the metal pan til spring? Or am I just being to OCD? Their entire coop and run is sand, so plenty of places to bathe. But they do love to sit or bathe in the tub.