Came across this little guy today in a tidepool at Jacksonville Beach in northeast FL on the Atlantic coast.
I assume it's a juvenile batfish of some sort. He had a unicorn-like projection that's characteristic of the shortnose batfish in the Reef Fish ID book, though his coloration is markedly different than the specimen in the book. I included the second (terrible quality) photograph with my sweetheart Jim's hand in it to provide scale. I don't have any good profile pictures of him, though I do have a 40-second video from this same aerial point-of-view, and I can email it anyone who's interested.
Can anyone venture a guess about him based on the scant photo info available?