I've not really had issues with the royal or blue eye with agression. There kept with large catfish over 3 feet and bass.
The blue eye defiantly takes over the best spots of wood though, although, there is a near 7ft tree branch and a 5ft branch in the tank. Maybe it's just the volume of water there in (2000L) .
The worst one for aggression was the spiney monster I owned. 8/9" of nastiness. Would attack anything that and near his long. Even the 3ft niger. The L600 i have is quite aggressive aswell. (He's in the grow up tank).