Today's Dive Site: Grand Cayman

Does anyone know what this sea monster is?
Diving Location: Grand Cayman
Dive sites: Orange Canyon and Oro Verde Wreck
Water temp: 90 degrees!
I dove two nice sites yesterday in Grand Cayman. Visibility topped 140 feet with glass-like blue seas. A puffer the size of a large loaf of Wonder Bread showed up on the first dive, along with two turtles, a nurse shark, and a whole squadron of arrow crabs. \
On the second dive I toted along my macro lens and found (in addition to more turtles!) a ton of Pederson shrimp, Christmas tree worms and this finned beauty (see the photo) which perched in front of a beautiful pink and green anemone. He was about 2 inches long. Anyone have an idea what this critter is?

Does anyone know what this sea monster is?