It's a beautiful tank for just a betta, but there are no other fish that will be able to live in there. Almost all other small fish need groups or schools, and that would overstock you. Further, it doesn't have a big enough footprint for other species.
If you want a companion, look at a nerite snail or some shrimp.
Beautiful betta, by the way.
What's his name?
If you want a companion, look at a nerite snail or some shrimp.
Beautiful betta, by the way.