Housing a male with a number of females is relatively easy - as long as the male is not too docile nor vicious. He will attack the females during the first few hours to a day but eventually he will calm down. IME the key is that he must constantly come in to contact with the females - the more females the better. Eventually he will tire and calm down. Without challenges nor being threatened, he will become docile.
But I have never succeeded housing males together without them fighting. A stressed "chicken" can be housed together and young males that hasn't been separated. But I will always have torn fins. And once they're taken out, say to breed, I can not put them back in the sorority with males.