What would be a good rule of thumb for raising a variety number of chicks? How much room do they need? Say 5 chicks, or 10 chicks, 15 chicks, and up to 20 chicks at one time. We have never hatched more then 4 eggs at one time so this has not been an issue for us. We just got the Brinsea Octagon 20 and I plan on trying to hatch up to 20 eggs. From what I have read we should hatch 15 plus chicks, so this will be a big change for us and I would like to accommodate the chicks with plenty of growing room.