Ok, I've had (or currently have) the following:
Oscars
Texas
Red Texas
Carpintis
Dempsey
EB Dempsey
Convict
Salvini
Flowerhorn
Red Devil
Blue Acara
Green Terror
Port (Brown Acara)
Bifa
Jaguar
Friedrichsthalii
The MOST aggressive so far have been (in this order):
Carpintis (every other fish stayed at the other side of the 125g)
Flowerhorn
Red Texas
Of course, each of the others have been aggressive in different settings (i.e. the Salvini would beat up on everybody when we had him in a different tank, separate from the larger cichlids). The Bifa has killed two females we tried to mate him with.
Oscars
Texas
Red Texas
Carpintis
Dempsey
EB Dempsey
Convict
Salvini
Flowerhorn
Red Devil
Blue Acara
Green Terror
Port (Brown Acara)
Bifa
Jaguar
Friedrichsthalii
The MOST aggressive so far have been (in this order):
Carpintis (every other fish stayed at the other side of the 125g)
Flowerhorn
Red Texas
Of course, each of the others have been aggressive in different settings (i.e. the Salvini would beat up on everybody when we had him in a different tank, separate from the larger cichlids). The Bifa has killed two females we tried to mate him with.