well my big dovii did break a 6x2 but I didn't find him awfully aggressive, sure they can be mean but imo nothing compared to a hornet they just want to cause hell all day. Even when I do water changes everything I put in the tank is a target and he wont bite it and let go... bugger keeps pulling on it, he has even taken a chunk out of the otto. none of my dovii do this and I have a few large-med males - females.
I would also put oreochromis high on the list, but they calm down and hype up. Sometimes they can be nutters bashing up every fish in the 550 and most of the time he just relaxes, they pack a bit of size too.
salvinis > cons also imo theres bit of size difference but when salvinis breed they bash up fish much larger and do a lot more damage. My pair constantly bashes the 2 pairs of cons in the tank.
I would also put oreochromis high on the list, but they calm down and hype up. Sometimes they can be nutters bashing up every fish in the 550 and most of the time he just relaxes, they pack a bit of size too.
salvinis > cons also imo theres bit of size difference but when salvinis breed they bash up fish much larger and do a lot more damage. My pair constantly bashes the 2 pairs of cons in the tank.