The Flagtail Trigger is commonly referred to as the Half-moon Triggerfish, Yellow-backed Triggerfish, Half-moon Picasso Fish, Black Triggerfish, Goldenfinned Triggerfish, Goldenlined Triggerfish, Yellowstreak Triggerfish, Yellow-backed Triggerfish, Blue Belly Triggerfish, Blue Belly Sufflamen Trigger, Bluethroat Trigger, Whitetail Trigger, Whitetail Triggerfish, White-Tailed Triggerfish, White-tip Trigger, White-tip Sufflamen Trigger, White Rim Triggerfish, White Rim Trigger and Haremic Triggerfish. There is a large difference in appearance between adults and juveniles, where the juveniles have a white underbody with the upper half separated by a black line that runs across the eye and has yellow coloration on top covering the dorsal fin; and adults are a dark color all over with red markings at the base of 2nd dorsal fin and anal fin and blue coloration underneath the front part of its head. The Flagtail Trigger chiefly feeds on a wide range of food items, including live coral, algae, sea urchins, crabs, mollusks and other invertebrate groups as well as fish and sea squirts. It is one of the intelligent and curious fish and requires a plenty of space to swim along with many hiding places in the tank. If not given a large community aquarium, it might turn aggressive. The Flagtail Trigger grows a size of 9-11 inches as an adult and needs to be kept in a larger tank of at least 100 gallon. The Flagtail Trigger thrives well in a moderate temperate range, and often found vocalizing using a ?grunting? sound. Since it might feed on corals, the Flagtail Trigger is not considered safe in reef tanks. It features a spine that held erect as a warning to other fish to stay away. The Flagtail Trigger blows shallow depressions in the sand for nesting and if approaches by invaders, it raises its spine as a warning.
The Triggerfish family is comprised of peculiar shaped fish with two dorsal fins. The first dorsal includes a large spine that these fish use to lock themselves into places where they sleep or hide. The Triggers are also well known for their blowing behavior that they use to move items around in home aquariums. They will also pick items up with their mouths and move them. This is likely instinctual behavior that has rolled over from their nesting preparation. These fish can be aggressive, especially when feeding.