I keep forgetting my little sister has a Betta, too. The poor thing was stuck in a half gallon bowl
. He's very active, so he's obviously one of those Bettas that LOVES larger tanks more than the rest. I just searched throughout the house and found an old 1.5 gallon kritter keeper for him. It may not be 2.5+ gallon, but it's much better than his old one.
This Bettas fins are SHREDDED from sleeping in a plastic plant she had. Once I found the keeper for her she decided to get rid of the plant and replace it, so now her Bettas going to be happier and healthier