The MBU is fine with them, just for the video I used more food then usual. I usually feed the others first and then hand feed him or toss a bunch of shrimp to him. He does scare me sometimes like when the Goldy Pleco is sucking on a big piece of shrimp, the MBU sucks it out from the pleco.
I picked up the Tilapia at Jacks Aquarium, was only $20 and he was in a small tank with other cichlids and didn't seem to bother anyone, so I took the chance. Usually they are mean, at least the ones I've had in the past. He gets along with everyone, here and there you will see him waving his body at the others, he likes to chase the Sun Cats because they chase each other and then he joins in, but he doesn't do anything to them.