A cowfish is a super addition, we love ours, but thats a little high in price! The scientific name is below..along with a brief blurb about them. They are VERY ich prone, so be careful to quarantine him properly before adding him to your tank.
The Cowfish Longhorn (Lactoria cornuta) inhabit the reefs of the Indo-Pacific, usually in the less turbid waters. The body is yellow and covered with white dots, and is occasionally referred to as the Yellow Boxfish; however, the Longhorn is not to be confused with Ostracion cubicus, commonly called the Yellow or Polka Dot Boxfish. In the wild, it is not uncommon to see a 20" specimen, while in the aquarium the Cowfish Longhorn tends to be dramatically smaller - 16" or less.
No one has mentioned it yet...are you aware of the possiblity of toxification with this species?