you can vent them to sex them.
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demasoni are very aggressive, territorial fish, they wont do 'just thrown in' with cichlids, they HAVE to be compatible or able to stand up for themselves, or they get harrassed/killed.
they need 1m to 3f ratio.
diet can be cichlid flakes, pellets, feeders (for bulk not nutrients), peas etc
they breed from a very early age, smaller than a lot of cichlids that get to their size. i have personally seen a 1.5in demasoni holding, no joke.
they are a beautiful fish to get though, and have so much personality. can i ask what else u have in the tank? xx