I was told today by someone who saw the fish in person that it was not a lantern.
He said he thought it was a hybrid of some type, if wild caught, which I assume he was. He mentioned Epholopholis Polleni and a Banded Grouper as the closet things he could think of. Thoughts? A Polleni is pictured below. The fins are different among other things.
He is becoming even more aggressive. He devoured my Damsel (larger than the spotted in the tank) and will attack my hand if placed in the tank. Currently in the tank is the unknown fish we are discussing, a spotted grouper slightly smaller than him, a brittle star, and a larger Fiji Foxface.
Oddly enough, this fish and the spotted seem almost to be friends. They will even share the same hiding spots to the point of resting against one another, when the spotted isnt attatched to the rocks (often upside down) blending in.