Would your rainbow shark distress your betta if you put them together?

no i put my veiltail red betta a male of course in with a rainbow shark and a variety of a bunch of fish i have 2 bala sharks 5 cherry barbs 6 tiger barbs a rainbow shark a pleco and a betta in with them i have had many fish in with bettas the only one they ever went after was the crab! it killed it :'(