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With all males it may be best to get only one of each species as the dominant of of one species will bully the less dominant males of their own kind, but I can't say for sure on this. I've got about 20ish mixed gender Africans in my 55gal so I'd shoot for 15-20 individuals for your tank.
Will you be buying juveniles are already sexed adults? If juveniles then get fish in groups of 3-4, this way you are more likely to get at least one male and be able to pick which males to keep and then remove the females once they mature.