fish id from hawaii...tang or not

I've searched and can't seem to find this guy.

Naso Unicornis - The Bluespined Unicornfish --- They usually appear all gray with vibrant blue spines and accents.

Cool photo - showing a more unique color pattern!

Yes this is a blue spine unicorn fish or also known in the marine aquatic trade as a (Vallgini Tang).

And yes, they are related to tangs and surgeonfish.