Dwarf Red Scorpionfish (Scorpaena vesperalis) ?
~5cm TL (compare size to blade of dead seagrass, and mussel shell in photos).
Large bushy tentacles over eyes
Night dive, at 6m depth.
The area has many small scorpionfish at night but this stands out as different. As it is less than 3 cm long, it is much smaller than others, so I have always assumed it may have been a juvenile Maxillicosta scabriceps but is substantially different in appearance