In the wild most fish have thousands and thousands of gallons of water. They have their own territories to protect but if a fight does happen theres plenty of room for the weaker one to escape. The jackass who made the video should have done something to stop it. The poor midas was getting beat up by a fish way bigger then it was. The fight should have been stopped or better yet prevented by keeping such aggressive fish in either a very large tank or separate tanks.
