I have chickens about 1/1/2 yrs old that I incubated 7 of their eggs, 6 hatched. They are now about 6 months old and I want to consolidate the 2 coops into a single large one. How do I do this without them fighting and killing each other? They free range in the yard together but eat in "shifts" and older ones chase younger away from treats. They are laying in the same coop but roost in their separate coops.