I had my first real fight today. I got home from work just in time to watch my dominant male assert pressure on the second male for the prime hiding place. Usually this ends in the smaller male swimming off and being chased around the tank once resulting in at most a torn fin. Today however, he decided to stand his ground. They swam in circles biting each other in the sides. I really wanted to break the fight up, but decided to let it run a bit. Both fish ended up getting pretty banged up, but the second male definitely earned respect from the dominate male. I am hoping that my gamble of letting them fight it out will pay off with less aggression down the road.