Another Betta fish question

The commonly sold 'betta bowls' have allowed people to believe that betta fish can be kept in to small of tank. When you say everyone else was keeping a betta in too small of a tank, they probably were.

In order to properly keep a betta fish, you need a minimum of a 5 gallon tank (though more never does hurt), with a heater, and also a filter.

I would guess that Frankie probably was kept in too small of a tank, however, there is nothing that you can do about that now. If you are interested in getting another betta fish one day, just make sure to keep the betta in the proper environment.

Best of luck!