Its a Leopard or Potters Wrasse. One of my favorite fish, but they are just very hard to keep and I wouldnt recommend them unless you have experience with finicky fish or an established tank. I ordered 4 of them, 1 died in shipping and the other 2 died that night from stress just to give you an idea of how fragile they are. Luckly this guy pulled through and I got him to accept frozen foods eventually, and he picks at the algae sheets.