I kept one for about 6 months. One day, out of the blue, he started picking at my Volitan. Over a few days, he picked off many of the lions fins. The Lunar Wrasse found his way back to the LFS.
I was also amazed by its eating. He would eat anything, and used his speed and agility to get as much as he could quickly.
I got the Volitan shortly before the LW, and I also later got a Snowflake Eel. I had to ween both the lion and eel off of live feeders. I would still occasionally feed live fish for the eel as I first got him and tried to help him adjust to my tank. When I put in a couple of live feeders, the lion, the eel, and the LW all went after the feeders. I had seen the LW eat big chunks of shrimp, but not a whole fish. He bit the feeder in half and then ate each half. Somehow he knew those fish were offered as food, but he knew the group of Green Chromis were not.
The LW never acted aggressively toward anyone except the Volitan. The Volitan did recover and regrow his fins over the next number of months. It's too bad it didn't wor out though.
They are very curious fish, and my LW would even take it to the point of testing my patience. They are beautiful, smart, and add character to a tank, but make sure they will get along with everyone.