The Mandarin Dragonet is a strikingly coloured fish, swirled in green, orange, and blue.
Despite its calm, slow-moving charm, it is an advanced fish because of its specialised diet of small live invertebrates, mainly copepods.
Most mandarins die slowly of starvation in tanks that cannot sustain a copepod population.
Success needs a large, mature reef, ideally with a refugium, and patience to establish a thriving food supply.
Housing
Provide a well-established reef of at least 200L (55 gallons), and realistically larger, with abundant live rock and a sandbed that hosts copepods.
A refugium or pod-culturing system is strongly recommended to replenish the food supply.
Keep temperature 24-27C (75-81F), salinity 1.024-1.026, pH 8.1-8.4, and ammonia and nitrite at zero.
The tank must be biologically mature, never new, before a mandarin is introduced.
Diet
A specialised carnivore that grazes copepods and amphipods picked from rock and sand throughout the day.
A single fish can quickly exhaust a tank's pod population, so a refugium and regular pod top-ups are important.
Many individuals never accept prepared food, though some can be trained onto frozen cyclops, baby brine, or pellets, and captive-bred mandarins take prepared diets more readily.
Choose feeding specimens whenever possible.
Health
When properly fed, mandarins are reasonably hardy and resistant to ich thanks to a thick protective slime coat.
The main health risk is slow starvation, visible as a pinched belly and hollow stomach over weeks.
Quarantine and stable water remain important, but the single best safeguard is confirming the fish eats and maintaining a robust food supply.
A plump, rounded belly indicates a thriving mandarin.
Temperament
Peaceful, slow, and shy, it spends the day methodically hopping across rock and sand hunting pods.
It is reef-safe and harmless to corals and invertebrates, making a calm community fish.
Males are territorial toward other males, so keep only one male per tank; a male and female can coexist in a large system.
Avoid fast, greedy tankmates that outcompete it for food.
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