Sargocentron diadema
Sargocentron diadema, known commonly as the crowned squirrelfish, is a member of the family Holocentridae in the order Beryciformes. Squirrelfish in general are large, active, nocturnal fish which are usually red in color. Distribution. The crowned squirrelfish is commonly found on the reefs of the Indo-Pacific, from East Africa to Tahiti. Description. The fish is bright red with thin white lines crossing from the gill cover to the caudal peduncle. The gill cover has two vertical white lines. A third line runs along the upper lip and below the large eye. In captivity. This species is sometimes  kept in aquaria. It is an active, shoaling fish which is kept in large tanks with other individuals of the species. Other species of a similar size can be kept with it, but it may eat smaller fish. It can be sustained on meat-based fish food. The aquarium is kept between 72 and 78 °F (22-26 °C) the pH is about 8.1 to 8.4, and the salinity is 1.020 to 1.025.