Mmmmm, you guys are taking too long!
Big cichlid, peaceful too....I would have thought a choccy or severum but it's not gonna be, at a guess is it an Uaru although I would have thought you'd need a group? Or perhaps a texas relative, i.e. a pearlscale (Herichthys carpintis)? All the central biggies are nasty critters...I'm stumped