All the salvini I kept were very aggressive, and get more so as they age.
And I agree with Dan, other cichlids in the same tank, are problematic, but live bearers as dithers are your best bet, as long as they are large enough not to be eaten.
MFK member newworld has caught them in Mexico, and kept those wild type salvini, and I believe he considers them "pound for pound", one of (if not "the") most aggressive North American cichlid.