Quote: Until breeding season hormones kick in...
Better prepare yourself, cuz it'll most likely get ugly. Mixed flocks that include Guineas at breeding time can get pretty aggressive towards each other, with the Guineas usually being the biggest problem and most aggressive.
Hope your mixed flock stays peaceful and content, but more often than not the Guineas will be the ones that start causing problems. At the first sign of aggression I'd boot all the Guineas out so your other birds don't suffer blood loss or end up dead. JMHO. Best of luck with them tho.