The Red Mandarin Dragonet, Synchiropus rubrovinctus, is a diminutive benthic dragonet from the Western Pacific. The body is elongate and slightly flattened from above, with a short snout and large, high-set eyes. Four vivid red bands cross the dorsal surface of the head and body, and the first dorsal spine is drawn out into a fine filament that is especially conspicuous on mature males. Published collection records span Hawaii, Japan, and New Caledonia, and at an adult size near 3 inches this remains one of the smallest dragonets an aquarist is likely to encounter.

In the wild, this species lives in direct contact with the bottom, occurring over coralline gravel, open sand, and coral rubble. Most documented collections came from relatively deep water between roughly 25 and 130 meters, although one Japanese specimen was taken from a shallow tide pool. Recreating that substrate character matters more than volume: an aquarium of at least 30 gallons with a generous open sand bed, scattered rubble, and abundant live rock surface gives the fish the grazing terrain it uses constantly.

Care is genuinely demanding. This is a slow, deliberate feeder that depends on a steady supply of tiny benthic organisms, and it should be reserved for aquarists prepared to sustain that supply over the long term. Captive breeding has been reported for the species, and tank-raised individuals, where available, adapt far more readily than wild-collected specimens. Sexing is straightforward once fish are mature, as the elevated filamentous first dorsal spine identifies males.