Betta buddies -- Yes and No
I had one male Betta totally stripped of his fins by zebra's--he was moved and the fins grew back.
That male went on to live peacefully with neons, rasboras, snails, shrimp and cories. I have had several other makes that also did well in a community.
On the other hand, right now I have one half grown Betta (most likely a male), that went into full-on predator mode and tried to kill a ghost shrimp within seconds of the shrimp, (which was as big as him!), going into his Evolve4. I removed the shrimp and I will not try him with anything else--other than possibly a snail.