What type of naso tang was this?

[swreefer]

I was watching a show on TV last nite about places to go diving. When they showed one area in Hawaii, the camera zoomed in on the best looking naso I had ever seen. The ones at the LFS never look like this one. It had long streamers on the tail, really dark coloring, and the part that caught my eye was the huge dorsal fin. It was bigger than any others I had seen. It was white with a black stripe on the bottom. Any idea what type this was?