At 450 gal, I think it's safe to put them all in at once, there is plenty of room to hide and run.
And this also spread the aggression around. They don't know who to bully first.
I would still tape mirrors on either end of the tank to confuse the fishes even more.
But others might disagree. I have my own UFC gym in my tank, LOL. So maybe don't listen to me.
Another strategy is to sump the biggest ahole bully in the tank right now, and then introduce him back when the other fishes are settled.