I have a 4'x8' coop 4' tall, artificial light inside for 12 hours a day with 10 chickens. 5 sex links are 6 months old and 5 isa browns are a little over a year. Feed them layers mix 2 lbs a day. Let them free roam 5 to 8 hours a day. 3 nesting boxes 10'x14' run. No eggs! What am I doing...