kaitG, with 6 hens, I would only put in one nesting box. If you put in multiple, they'll only use one anyway. They like to lay where their eggs will be "safe" and a nest that already has eggs in it, has already been determined to be safe. They will literally queue up to lay their egg if that one nest box is occupied, and will get sometimes get a bit testy while waiting, trying to hurry the hen along. If you make the box bigger, several will squeeze in to lay at once. My nest boxes are 12x12 and I've seen 3 full size hens in at the same time, half sitting on top of one another. They seem to work it out.