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Aulostomus Maculatus
About 18-24" long, Atlantic Ocean off the coast of Puerto Rico in the rincon area
Apparently Trumpetfish can change their colors. All I could find is this one species, but variable pictures of the fish. I'm pretty sure its a trumpetfish, but am surprised by how variable they are in color.
http://reefguide.org/carib/trumpet.html
https://www.flmnh.ufl.edu/fish/Gallery/D...