Black Skirts as Dithers/Midwaters

I have a school of black skirt tetras from a community tank that I plan on breaking down pretty soon. They have always been the bosses of that tank. they're as fast as f-16s and eat 80% of the food I drop in before anything else gets a bite. They mostly chase each other, but they eat guppy fry and I've even seen them eat small neon tetras.

Anyway, this got me thinking they could hang out in a 75g with ~20 Multis. I figured they would hang in the top half and the Multis would ignore them unless they decided to go for fry (which I really don't need anymore).

This video is the first one... He ended up hiding in the corner. Any idea if the Multis will chill out or be more intimidated if I add more black-skirts, or should I really follow the classic advice of keeping Africans and SAs apart?