Welcome here, I think You can add some tetras or guppies to your tank. Molly fish are generally peaceful, but they can become aggressive at times. There are three things you can do to help your molly fish be less aggressive: First and foremost, This keeps the tank from becoming overcrowded. Make plenty of hiding places available. Keep more female molly fish than males; a ratio of three females to one male is ideal. What about your moly?