All those striped Melanochromis seem pretty obnoxious, but you can always try in a 6 foot tank. You want it rather crowded, and a good idea to keep any other species that have males that might challenge the Melanochromis. Chipokae is a favorite, males look so cool but get big and do not tolerate challengers. As far as Vermivorus, I'm not sure that the hobby has always had them labeled correctly. The whitish Vermivorus females might be good since they would be very different from those other species.