Yup, definitely G.Tile...
if it were a Gymnothorax Polyuranadon you definitely can't miss it... just look at the Pics 888fish posted up, and you can see an immediate difference...
G.Tiles tend to be more of a grayish color with yellowish / gold speckles through their bodies, while G.Poly tend to have a more yellow base color with larger black leopard print type markings...
I have added aquarium salt about 10 tablespoons, he perked up a lot, just havent seen him eat yet.