I'm expecting 13 babies in <2 weeks and am trying to find something big enough to put them in! Have read 1 sq ft per chick and 2 sq ft per chick; both numbers are much bigger than I imagined. 13-26 sq. ft - huge!! A friend has more than 13 in a big plastic horse trough, and they are doing fine with much less space than that. Realistically, and practically, must they have so much space?? If I get a refrigerator box, should I cut holes in it for ventilation? Second question: have read not to clamp light on brooder but to hang it over the brooder. How does one hang a light? What does it attach to? Thanks for any help you guys can offer!