I had a really mean one and he killed one female and tried to kill one of my others. You could try several females, some times just mean. He could be put into a tank with some semi-aggressive fish. Sent my mean one to live with Giant Danios a shy Pacu and a blue Gourami. Didn't cause any more trouble.
My other male is just as gentle and sweet as can be. One of my favorites! I would separate them, add to a different tank, return it to the store or rehome to someone with not too mean, but not little tetra fish. My other was just too mean, wasn't even ok in tank with other peaceful fish, by himself, no other bigger fish and nipped at fish.