Mumma.of.two
Aquarium Advice Obsessed
got-to-love-Chiclids said:Betas are air breathers and so there for they do not require a filter and or an air stone and I have mine in a beta cube
Yes, they can breathe air. The reason for the filter in a Betta tank is not to provide oxygen but to provide a healthy stable home for them (cycling the tank). They prefer still but not stagnant water.
I certainly hope you are changing out the water every few days in your cube to prevent ammonia build up.