Hi all, I'm in prep stage now, hoping to get chicks sometime in Feb. Quick question: is an aquarium that's 12" x 20" large enough for 12-15 chicks? For a week? If not, I can find something else. Was planning on using the aquarium when I was thinking of getting 6-8 chicks, and now I'm thinking more chicks. Naturally. Is there a 'rule of thumb' amount of space per chick? Babies and as they get bigger? Thanks!