Will your Betta kill Cory and Molly?

Bettas are generally peaceful fish, but they can be aggressive towards other fish, especially those that are smaller or have long fins. Corys and Mollies are both relatively small fish with long fins, so they may be at risk of being attacked by a Betta. However, it is important to note that not all Bettas are aggressive, and some may live peacefully with other fish. If you are considering adding a Betta to your tank with Corys and Mollies, it is important to observe the Betta's behavior carefully to ensure that it is not being aggressive towards the other fish. If you notice any signs of aggression, such as chasing or nipping, you should separate the Betta from the other fish.