Buy the 534 single brooder and the four-inch expansion ring, that gives you fourteen inches of headroom. Here is a five-week-old chick and it is not even close to needing the extra space above. I didn't put the expansion rings on all of the top brooders those are for the two to four-week-old chicks. All of the lower ones have the rings on them.Yes i know but i am going to only have one soo i need one that will fot them when there eight weeks old and they get pretty dang tall sooo