This appears to be Ostracion rhinorhynchos. Coloration in O. nasus and O. rhinorhynchos is similar and both can develop a large bump on the forehead. O. nasus differs in the presence of a hard ridge running lengthwise down the center of the back, while the back of O. rhinorhynchos is mostly flat. This one, photographed at Seraya near Tulamben, was dragging along a sharksucker (Echeneis naucrates).
Created 16 March 2023