This coral grouper was waiting in ambush under a coral ledge. The grouper family is quite large and different species can have very different colours. These medium sized predators often lie in ambush close to schools of small fish.
Nikon D700, Nikon 28-105 mm macro at 105mm, F8, 1/60th, ISO 400, Ikelite Housing and Ikelite DS160 strobe set on TTL.
Marsa Shagra South House Reef, about 15 metres down, Marsa Alam, Egypt.