As an aquarium owner, it is understandable to feel helpless when fish fight. You can’t exactly jump into the tank and break it up. But, as you can see from this article, there are ways to manage aggressive behaviors in an aquarium.Preparation and research are key to avoiding unpleasant situations. Knowing the temperament of a fish, compatible tank mates, feeding preferences, and appropriate tank conditions can prevent situations that encourage aggression.Proper feeding and tank maintenance can keep conditions from deteriorating to the point where fish lash out at each other. Quarantining fish, either before adding them to your tank or when illness appears, can stop strong fish from bullying sick fish.As I always say, the more you can learn about aquarium care, the better you will get at this fish-keeping thing. Mistakes will happen, so don’t beat yourself up. Just keep on doing the best you can.