Perhaps it's a juvenile form of an easily identifiable species. Wonderful, subtle, pastel coloration. Any clues?
--Pier Carlo Talenti
It's sometimes tough to tell the difference between an ocean surgeonfish and a doctofish - both are members of the surgeonfish family. If there are body bars then it's a doctorfish. Unfortunately those bars can be so light that they can't be seen. The ocean surgeonfish usually has a more lunate tail (more concave) and a clearer pectoral fin. So sometimes it's easy and sometimes it's tough to tell the difference between the two. All in all, I think the photo is of an ocean surgeonfish.
Thanks for the ID's, DiverDave.
Pier Carlo Talenti
REEF Headquarters | P.O. Box 370246 | 98300 Overseas Hwy | Key Largo, FL 33037 | USA Phone: 305-852-0030 | Fax: 305-852-0301 | email: firstname.lastname@example.org