Hello I have 14 adult hens ranging in age from 1 year to 3 and 4 bantam hens that were given to me and somebody else has 10-12 more they want to give to me and start fresh. I made a brooder box out of an old filing cabinet and it has 8 "nests" in it. My question is this, with the addition of another 10-12 birds will this be enough boxes? I've seen a rule of thumb is 1 box to three birds but only a handful of these birds are going to be under 2 years old so not prime laying age.