I never bought the Betta vase but I did fall into the trap of a Betta not needing much space, a 1g is just fine. If I'm not mistaken people who bought the Betta vases were typically told they didn't need to feed the fish because it would eat off the roots of the plant. Eventually the roots would grow so much the Betta if it survived for very long, couldn't get to the top for air. Since I started 6 months ago I have learned a lot and none of mine are in anything smaller than a 10g. The smallest I'd ever go is a 5g. I see the difference in the behavior of Bettas from being in the 1g to now being in the bigger tanks, they're so HAPPY HAPPY HAPPY.