Which would be better for 5 or 6 hens? One big trough type or two smaller that are stacked on top of each other so they have a "high" and a "low" option? They are used to having the nesting box at floor level because their tractor is small and we need to stay small for now. I am building a 4x8x4 coop to replace my tractor and I am finding I have sooo many questions. This is probably just the first but it is wicked important to me. Thanks.