Diadem Dottyback

The Diadem Dottyback is widely regarded as the most peaceful member of the dottyback family, making it an exceptional choice for aquarists who want the vibrant colors of a dottyback without the territorial aggression that plagues most other species. Its body is divided into two striking color zones: the anterior half displays a rich magenta-purple, while the posterior half transitions to a bright lemon yellow. This bold bicolor pattern makes it one of the most visually striking small reef fish available.

In the wild, Diadem Dottybacks are found on coral-rich reef slopes and walls in the Western Pacific, where they dart between crevices and overhangs in search of small crustaceans and worms. Despite being a dottyback, this species shows remarkably little aggression compared to its infamous relatives. It may occasionally chase a similarly sized fish away from its preferred hiding spot, but it lacks the persistent territorial aggression that makes many dottybacks problematic in community tanks.

The Diadem Dottyback is an ideal beginner fish that combines stunning coloration with easy care requirements. It is completely reef-safe and will not bother corals or invertebrates. Like other dottybacks, it will consume small bristleworms, providing a useful pest control service in the reef aquarium. Captive-bred specimens are increasingly available and tend to be even more docile than wild-caught individuals. Its small maximum size of just under two and a half inches makes it suitable for nano reef aquariums.