My bala sharks (Wallace & Earlstine) are possibly the most laid back sharks ever. When we got them research told us that they are jumpers and will probably eat anything that fits into their mouths.
Ours have never jumped, much less made a splash, and have never eaten any of our fish. They live in my planted 55 gal with a variety of other fish and shrimp, including a few female bettas.
My favorite example of this:
Adding new female bettas to the tank. Wallace swam over, pecked at her. She flares and he is like "oooooh. You fish, not food.. you knows where food is?" She swam away and he went about his business of searching for flakes on the substrate.
Hilarious, to say the least.