Yeah, we added a Mystery Wrasse when we already had a Sixline in the tank, and the Sixline and Pygmy Angel paired up and bullied the Mystery.
We knew that the bullying might subside, but we weren't about to risk such an expensive fish, so we tore the tank down, got the Sixline out (they're fast little buggers!) and now everyone lives in peace. The Pygmy and Mystery have even become friends!
They are beautiful fish for sure, and ours is quite the pig. He ate a Cleaner Shrimp in one sitting! It was quite cannibalistic, but fascinating at the same time... especially when all you could see of the shrimp was its antennae sticking out of the Wrasse's mouth!