Do clown fish half to live in a filter tank?

No, clownfish do not have to live in a filter tank. They can live in a regular aquarium as long as it is properly set up and maintained. A filter tank is a type of aquarium that has a built-in filter, which can be helpful for keeping the water clean and free of debris. However, it is not necessary for clownfish to live in a filter tank, and they can do just as well in a regular aquarium.