Marginate Damselfish

The Marginate Damselfish is an attractive Red Sea endemic that features a predominantly dark black body elegantly trimmed with distinctive white margins along the dorsal, anal, and caudal fins. This white-on-black framing creates a clean, graphic appearance that sets it apart from other Dascyllus species. At only 2.5 inches maximum size, it is one of the smallest members of its genus, making it suitable for smaller aquariums than many of its larger relatives.

In the wild, Dascyllus marginatus is found exclusively in the Red Sea and Gulf of Aden, where it inhabits shallow reef environments rich in branching corals. Juveniles form tight aggregations among Acropora and Stylophora coral branches, a behavior characteristic of the Dascyllus genus. The Red Sea origin gives this species an exotic appeal, as Red Sea endemics are often prized by aquarists for their unique status and the renowned clarity and diversity of Red Sea reef ecosystems. As adults, they become moderately territorial but are generally less aggressive than the larger Dascyllus species.

In the aquarium, the Marginate Damselfish offers the classic Dascyllus hardiness in a smaller, somewhat less aggressive package. While it will still display territorial behavior, its diminutive size limits the impact of its aggression, making it more manageable in community settings. A 30-gallon aquarium is adequate for a single specimen. Provide branching coral structures or rockwork with crevices for shelter. The species is completely reef-safe and accepts all standard aquarium foods readily. Its Red Sea endemic status makes it less commonly available than more widespread species, but it is an appealing choice for aquarists who appreciate regional specialties.