I have been reading that I need 4ft coop space and 10ft run space for chickens. I am getting combined total of 25 Cornish X Rocks and Cornish Roasters that I can butcher in 2-3 months. I want to treat them well, but wasnt planning on having 250sq ft of run space for them. What can I get by with and still be treating them humanely? I have enough space in the coop because it is 10X10. This is my first outing with chickens and really dont want to screw up.