I have currently a 4x4 coop. 3 nesting boxes on the outside so I utilize full floor space. My chickys are about 2 weeks old so they are still inside. I currently have 6 3 RR and 3 plymoth rock. is 6 too many for a 4x4??? I have a 10x10 run and will be free ranging when pos. (when my shepherd doesn't want to rip the "squeek toy" apart) Thank you!!