This is an easy question...Dovii. Their very interactive and fun fish to have. A male dovii will assassinate every tank mate one by one and if it feels out matched it will wait till it grows a little then murder whatever is left. My buddy has a 24+in male in 400g+ tank with a female. This thing has almost tagged me twice. One person has to distract on one side of the tank while the other cleans. Cat was walking on top, tail touched the surface. It would of snatched it in if it wasn't for the top, ripped all the fur off the tip of its tail haha.
Jags & Tiger Motas are both stunning fish with Motas getting the nod in the looks department IMO. Motas might even top the jag on the nastiness scale to. Jags are starting to become like tiger oscars everyone & their mom has them now. That being said I'm getting a tank setup for a pair of jags in the mancave now..with motas next inline
These 3 are the top of the parachromis pecking order in my book with the dovii being top cichlid period.