We have a lot of Betta's lying at the bottom of their tanks questions. 23 to be exact.
Any one care to wade in on which may be duplicates and the selection of good dupe targets?
These have good/decent answers, the second one would need to have the question formatted better. Husbandry is your number 1 issue with Betas as people who buy them are provided with minimal care instructions (led to believe they can be healthy in a glass jar).