Our last Beta lived forever in a small 1 gallon fish tank. Nothing else in there. He was a very "friendly" fish. DH "talked" to him every day and I swear he would start swimming around when he would come near! Our fault he died(long story), but friends replaced him for DGS with a really nice filtered tank with all the extras and some expensive type fish and they lived about a month. We are getting a new Beta and going back to our old bowl. We had a beta live in that same gallon bowl for YEARS.