Question. At what age do older chicks stop tolerating newcomers, typically? I have 6 chicks, 4 are 4.5 weeks and 2 are 3.5 weeks (not really worried about the younger ones, though). I am thinking of adding 2 more, they are 2.5 weeks-ish. They will definitely be bigger than my legbar, so not the smallest of the group, but they will be new, obviously. I can't set up a separate brooder and I use an ecoglow, so I don't know how I would split the brooder up since I don't know how to split the heater. Thoughts?