i currently have a pair in a 55. they are a lil rough on each other but nothing crazy. Extremely brutal towards the dithers when they spawn. Very active and outgoing. I have a thread in the media lounge with pics.
the #1 pound for pound meanest cichlid. i always wanted to keep them and salvinis together... but i rarely seem them available, and i dont really like meanie salvini too much. they sure are pretty tho
They're best kept in a large community of robust cichlids (where they'll be out and about and spawn regularly) vs. a species only tank (where they'll hide and beat on each other).