i don't have them, but i am interested in getting a few pretty soon, so i've been researching. for the most success, you'd want to get 5-6 young ones, and allow them to pair up on their own. it seems like they are pickier than some other cichlids, so it takes them a bit longer to choose a mate. when older, males will have colorful "worm" markings on their faces similar to discus, and usually (but not always) wil be more colorful overall. i think the males also have slightly longer, trailing fins. true heros severus are mouthbrooders, heros efasciatus or appendiculatus (sp?) are substrate spawners. otherwise the same.