That's Gus. He was sold to me as being a Dwarf Hawk Fish. Gus has quite a story, he was shuffled around at a large aquarium shop in Fresno, CA
over a dozen times in the course of over a year and marked down just as many times in price. Seems he like to eat whatever inhabitants he was introduced to. I picked him up for ten bucks. When my wife and I saw him after hearing his story and him, what seemingly to be following us around with chameleon like eyes we had to "rescue him."
He was a very pale color in the tank where he was, and was surrounded by fish over ten times his size! He's a happy camper now being the only fish on the block!!