As a side note, male and female bettas can't be kept together like male and female guppies or mollies can, they'll attack and likely kill each other.. ghost or cherry shrimp may be a good bet for your tank, though it depends on the personality of your fish. Some bettas don't mind tank mates, and others would be better left off alone.
♂ Nettlestung ♥ Pastel/Cellophane HM [RIP]
♂ Stormrunner ♥ White Marble dtVT [RIP]
♀ Willowisp ♥ Cellophane Marble VT [RIP]
♂ Skyshatter ♥ Butterfly Halfmoon [RIP]
♂ Starchaser ♥ King Plakat [RIP]
♂ Heartseeker ♥ Red/white DeT