Good looking mix!! You are lucky, my 210 is like a war zone and with a lot less ca/sa in it.
Sometimes less fish is not always better as far as aggression goes... keeping the tank a little "over stocked" helps with the aggression in my experience. Everytime I remove a fish from my community I'm concerned I may disrupt the pecking order and throw things into a frenzy or "war zone" as you called it. Luck plays its part too...
