Personally, i think if you go for a large cichlid like Green terror they should probably be the only cichlid in the tank. Could put a school of tetras of your choosing, a bristlenose pleco, and call it a day.
Another option: Solo N. tetracanthus, a bunch of livebearers like swordtails.
Or you could try a group of smaller cichlids like Sajica, panamensis, most of the cryptoheros/amatitlania species. One male and 3-4 females. With some livebearers. These are fun setups to watch and the fish still will beg for food, swim at the front.