I'm realizing the two leggorns I inherited as chicks are bantams, and I'd love to add one or two more to the family, but am unsure how many can fit comfortably in their quarters. I have a 4'x6'x5' run and a 3'x4' coop attached to it with a 15''x15'' nest box attached to that. We let them roam the yard 1-3 hours a day, but since we're in the city, we can't let them out all day. Any advice? There's a lot to be found about space requirements for standard breeds, but not much about bantams. My gut says one or two more tops, but being new to this, I'm not sure. We love the two we have and really want them to be comfortable and happy chickies.