From what I can see from the pic, like DEA, I also will say Clarkii. They most always will have a third white band at the base of there tale which blends into yellow at the end. A Sebea does not have the third white band but do have a yellow tail and the second white band continues into most of the dorsal fin.
If you could post a pic that shows the tail better would help.
This pic is a Sebea...
sorry, it not letting me post a pic now....