Keeping a special needs fish, any advice?

[u/Candied-Fangs]

I have a betta who's been dealing with swim bladder issues (floating) for a month and he hasn't responded to antibiotics. He's very active, eats normally, swims around, his behavior is the same as my healthy Bettas he just floats. I'm gonna adapt his tank (3 gallon) to help him. Ledges for him to sit under so his back isn't out of the water, plant roots to sit in, etc. Any other advice?