[untamed]

I think the first one is Naso brivirostris...possibly Naso annulatus...or possibly another one. Regardless.... Not commonly collected for aquariums. Huge. I think the Vancouver Aquarium has one similar in their community tank.

The 2nd one is Naso vlamingi. Commonly called the Bignose Unicorn, or Vlamingi Tang...but sloppily called "unicorn tang" by many shops. Very commonly seen in LFS as cute juveniles that have blue spots. Is the fastest growing fish anyone has ever seen. I have one that has grown from about 1.5" to 10" in less than 9 months. Again, reaches size of 2 feet or more.

The only thing I can say about the third one is that it looks malnurished. I have no idea what that one is.

I expect to see N. unicornis in your list. The blue-spine unicorn is not too difficult to get in the aquarium trade. It also gets pretty large though.

http://en.wikipedia.org/wiki/File:Na...lauklingen.jpg

And finally...there is of course N. literatus or N. elegans....the fish that are most commonly called "Naso Tang". A common name that is clearly inadequate as it would describe a huge number of Naso species.

http://www.fishbase.org/Summary/Spec...ry.php?id=1264

Gee...can you tell they are my favorite?