A bubbler is not a necessity for a betta fish, but it can certainly make their life more comfortable and fun. Bettas are a type of fish that is known for their ability to breathe air from the surface of the water. This means that they do not have to have a bubbler in order to survive. However, a bubbler can provide them with a more comfortable environment. It can also help to increase the oxygen levels in the water, which is beneficial for all fish.