If your feeling extremly lucky then do what i did - Rescue a poor little betta from a horrid pet shop

And pray when you add him to a community tank like i did
I seriously dont recommend it But my betta has only ever flared up once! when a black molly was eating his pea!!
He is really doing well and his fins are ok now but always have a back up plan because my partner has one by itself in a stunning 7g tank with filter heater low bubbles live plants and it flares up looking at itself!!
So always go by the assumption that even if you read this fish is great with that etc the fish dont always play by the book, Take my betta for example hes in a tank with
Neon Tetras
Buttercup pleco
Ghost shrimps
coryfish
German blue ram
saffiron mollies
Blackfin mollies
Black ghost knifefish
and not once has ever attacked anything in the tank
But he has a lot of place to relax and hide should he get stressed and place's for the others to hide to so its quite peaceful which im over the moon about
But dont take my word on it. It CAN be done But LUCK is 90% factor and ive got an empty tank with some water and a UGF on standby should something happen Sickness/Fights etc
Hope this helped somewhat?
More on the story
Depressing trip to a "pet store"