I know this has already been asked but I haven't seen many answers, and the two I saw were very different. One said 1 sq in per chicken a day, another said 4? Does anyone else have any input? I am going to have about 20-25 chickens and was thinking about feeding half of a 10"x10" container a day, right in between the two answers I saw. They would free range part time and have oyster grit and maybe some layer pellets if needed. Does that amount sound about right?