The Sergeant Major is oval in shape with upper body as yellow, and white to bluish silver below. It also exhibits five black body bars and mainly feeds on algae, small crustaceans, fish and various invertebrate larvae. Adult male Sergeant Major adopts a bluish hue while guarding the nesting site. It is named aptly due to the presence of black bars as it is referred to as ??sergeant major??, which resembles insignia in the military services. There is a minimal sexual dimorphism thereby it makes it very difficult to distinguish male from female, and hence difficult in breeding in captivity. Generally, the males guard the eggs during the four days incubation period prior to hatching. The Sargeant Major has the ability to camouflage itself by slightly changing the coloration according to the surroundings. The Sergeant Major is omnivore and feeds on small crabs, shrimp, and fish, invertebrate babies, and algae. The Sergeant Major is aggressive and may bully other inhabitant of the reef that is why they are unable to do well with smaller and peaceful fishes, unless it is given with a personal niche. It is reef safe only if kept with compatible species. It is easy to keep the Sergeant Major and to care the same in captivity and that makes it a decent choice for any aquarium.