Aside from the problems with temperature, I was wondering whether it was advisable to keep a 1 month old Australorp with a 1 week old speckled sussex. They are both girls and I'm hoping, not aggressive. I know the Australorp will be much bigger, but I am only getting 2 chicks and the sussex might get lonely on its own. Would it be easier to keep them separate (I have a 7 week old light sussex that might become friends with the australorp) or keep them together? In my experience with silkies, the older ones don't mind the younger ones at all but I know not all birds are as nice..