If you use them, I realize the chicks can only stay in it for likely two weeks, but as fresh hatched,how many would you put in a tray max? Paperwork says you can put 100, seems that would be pretty crowded, I was thinking more along the lines of 50 per tray for two weeks, then to a large enclosure. Just wondering if anyone has used a larger number per tray and if so for how long.