my snook was great. never tore up anyone but would defend him self well against my male mota. The snook and mota would lock lips but the Snook was never the aggressor, just holding his own and the end result would always be that both would stand down with minimal damage to both. OP wants something over 12+, a male snook would exceed that but I dont think i've seen a female over 12+. I'm no snook expert tho.
i trust my 14 inch midas with a 3 inch texas cichlid or a 3 inch convict. he doesn't pick on anybody except the clown knife, he has something against him lol.