Borbonius anthias

The Borbonius Anthias (Odontanthias borbonius) is a rare and spectacular deep-water anthias species that brings vivid colour, unique behaviour and high-end appeal to marine aquariums. Native to the Indo-Pacific, this species inhabits rocky reef slopes and caves at depths of 70 – 300 m, where light is low and the water stable. The body of O. borbonius is typically pale pink to purple, adorned with irregular golden-yellow blotches or patches and accented by lemon-yellow fins—earning it the common names “Blotched Anthias” or “Yellow-Spotted Anthias”. Because of its deep-water origin and limited availability in the aquarium trade, the Borbonius Anthias is coveted by serious reef-keepers and anthias enthusiasts alike.

In terms of aquarium care and reef compatibility, the Borbonius Anthias demands a well-established large system with appropriate conditions to thrive. Most retailers recommend a minimum tank size of 125 gallons or more (with some stating 80 gallons as the absolute minimum for younger specimens) to provide ample swimming room and stable water parameters.  Ideal water conditions include temperature around 72–78 °F, salinity roughly 1.020–1.025 sg, pH ~8.1-8.4, and alkalinity ~8–12 dKH. Because O. borbonius originates from deeper reef zones, it appreciates moderate lighting and plenty of rockwork, caves and crevices to mimic its natural hiding places. Diet is key: as a planktivore in the wild, in captivity it thrives on frequent feedings of enriched mysis shrimp, brine shrimp, finely chopped meaty foods, and a refugium containing copepods/amphipods. Although reef safe (harmless to corals and invertebrates) and relatively hardy once acclimated, this species is still best suited for intermediate to advanced hobbyists due to its cost, rarity, and specific care needs.

When selecting or housing a Borbonius Anthias, keep in mind that though juveniles may get along in small groups or harems, mature individuals often show semi-aggressive behaviour towards conspecifics or similar species. Because of its rarity and high value in the saltwater fish hobby, ensure that the specimen is healthy, actively feeding, and comes from a reputable source. Observing vibrant coloration, full fins and normal activity (rather than retracted behaviour) can signal a well-conditioned import. In summary: if you are searching for a rare, deep-water reef fish with stunning colour, unique natural history and serious “wow” factor for a spacious reef tank, the Borbonius Anthias (Odontanthias borbonius) is an exceptional choice for dedicated aquarists.