ya they are tough little fish. I have 4 males right now, and one female. The female is separated because they are so agro when breeding. But i am now trying to go for an all male 55 gal convict tank with all the morphs. and all the males i want to be BIG. So far i have 3 regular males 4.5, 4.75, and 5", and in a 20 gal. growout by himself i have a male pink con with lots of potential. I have seen some pics of these marbled males when they are big with nuchal humps and everything, and they look sick. def. keep us updated with all the fish in the future.