Ruby Red Dragonet

Geographical Origin and Habitat: Synchiropus sycorax is native to the Western Central Pacific Ocean, with populations primarily concentrated in the waters of Indonesia (specifically the Jolo Island region). It inhabits deep outer reef slopes, rubble areas, and sandy patches interspersed with volcanic rock formations at depths ranging from 10 to 40 meters. It constantly crawls along the substrate looking for food.

Taxonomy and Morphology: Belonging to the Callionymidae family (dragonets), this species was scientifically described in 2016. The specific name Sycorax refers to the storm witch in Shakespeare's play, due to its dramatic red and yellow colors. It features a scaleless, cylindrical body, large dorsal eyes that rotate independently, and broad pelvic fins used to walk. Adults reach up to 5 cm.

Social Behavior: It is a peaceful, slow-moving benthic fish that spends its day hunting for microfauna. It exhibits intense intraspecific territoriality; only one male can be kept per tank as they will aggressively fight, flaring their large sail-like dorsal fins to intimidate each other. It can be successfully kept in mated pairs or harems.

Coloration and Sexual Dimorphism: The species is visually stunning: the body is a brilliant ruby red with small white spots and dark markings, while the anal and pelvic fins are bright yellow with dark bands. Sexual dimorphism is highly distinct, with males possessing a much larger, more ornate first dorsal fin compared to females.

Aquarium Setup: Requires a well-established, mature reef aquarium of at least 100 liters, containing a large amount of mature live rock (15-20 kg) to support a self-sustaining population of copepods. It is highly recommended to run a connected, predator-free refugium to continuously supply the main tank with live microfauna.

Diet and Feeding: This is the main challenge in keeping this species. It is a specialized micro-predator that feeds continuously on live copepods and amphipods on the rockwork. It generally refuses dry foods. Training it to accept small frozen foods (like cyclops or oyster eggs) is difficult and requires patience.

Water Quality: Maintain stable reef parameters: water temperature between 22 and 26 °C, pH 8.1-8.4, specific gravity of 1.020-1.025, and nitrates close to zero. Clean substrate and excellent water quality are vital, as the scaleless skin of the dragonet is vulnerable to bacterial infections if waste accumulates on the sand.

Compatibility and Cohabitation: 100% reef-safe and peaceful, posing no threat to corals or tankmates. Do not house with aggressive or fast-swimming competitors (such as certain wrasses) that will quickly deplete the copepod population, as the dragonet will easily starve due to its slow feeding habits.

Aquarium Breeding: Spawning occurs at dusk, with the pair performing a vertical rise in the water column to release pelagic eggs. While spawning is possible in home tanks, raising the microscopic larvae is highly complex, requiring specialized live diets (such as specific rotifers and copepod nauplii).

Risks and Diseases: High starvation risk due to insufficient live food supply. While its thick, bitter mucus layer provides natural resistance against common marine parasites like ich, this scaleless species has a low tolerance for copper-based medications and sudden salinity drops.