also known as yellow damselfish, is a common sight in the reefs of the Indo-Pacific region. They belong to the family Pomacentridae, also known as the damselfish family, which includes around 350 species of small and brightly colored reef fish. Sulphur damselfish are relatively small, growing up to 9 cm in length, with a compressed and oval-shaped body that is typical of damselfish.

The body coloration of sulphur damselfish is bright yellow, with the exception of their caudal fin, which is white. Their eyes are rimmed in black, and they have black spots on their fins. These fish have a unique and interesting behavior - they are known to use their pectoral fins to scoop out a cavity in the sand or rubble, which they use as a hiding spot or shelter. This behavior is particularly interesting because it is rare to see damselfish digging in the sand.

Sulphur damselfish are relatively hardy and easy to care for in aquariums, which is why they are a popular choice for home aquariums. They are generally peaceful and can be kept in groups, but they may become territorial if they feel their space is being invaded. They require a well-maintained aquarium with plenty of hiding spots, as well as live rock and corals to provide a natural environment. They are omnivorous and can be fed a varied diet consisting of flakes, pellets, and frozen foods.

In the wild, sulphur damselfish are found in shallow reef habitats, typically at depths ranging from 1 to 20 meters. They feed on a variety of small organisms, including plankton and algae, and are an important food source for larger predators such as snappers and groupers. In some areas, they are also targeted by small-scale fisheries.

Overall, sulphur damselfish are a beautiful and fascinating species of fish that can bring color and life to any aquarium. While they are relatively easy to care for, it is important to provide them with a suitable environment that meets their specific needs to ensure they thrive in captivity. In the wild, they play an important role in the reef ecosystem and are a valuable food source for many larger predators.