I have read some people that have one that say they are the kings of the tanks. Mine just seems to be content to swim around looking for things to eat in the rock and sand. They are beautiful fish, add a lot of color and movement. When I first got mine my peppermint shrimp and my pom pom crab immediately became good eats for him. I knew this was a possiblilty but I have also read that them being in the tank first before adding the warsse may save them. Didn't!!! I would do it again though because I like the fish more than the inverts.