tough sell, I once made a mistake of buying that little guy years ago.. the lfs told me it was a goby, I looked closer once I was home and thought it was a wrasse.
I googled around then I saw what he turns into. he ended up in my sump for life.
he is a beautifull fish always swimming in front of the tank doesnt bother other fish the only reason i am selling him is cause i have aptasia and i cant put pepermint shrimp i my tank ,he should be in an agresive tank (there is nothing wrong with having this fish!)