What size tank? Do you have a light for the tank?
I would suggest buying something lowlight like Hornwort (a sprig of it can float in the tank and Bettas love floating plants) or an Anubias (they come in many varieties and thrive in any light). They are inexpensive and available in most LFS.
I would suggest buying something lowlight like Hornwort (a sprig of it can float in the tank and Bettas love floating plants) or an Anubias (they come in many varieties and thrive in any light). They are inexpensive and available in most LFS.