Why is my Spotted Mandarin losing weight?

Weight loss, often presenting as a pinched stomach or sunken dorsal area, is almost always due to a lack of live copepods in the aquarium. The tank may not be large or mature enough to sustain the constant foraging of the fish, or there may be competitors depleting the food source.

Will a Spotted Mandarin eat pellet or flake food?

It is extremely rare for a Spotted Mandarin to accept dry foods like pellets or flakes. Some can be trained to eat frozen foods like mysis or brine shrimp, but their primary diet must remain live benthic copepods.

Can I keep two Spotted Mandarins together?

You can keep a male and female pair together, but you should never keep two males in the same tank, as they will fight aggressively. Determining sex involves looking at the first dorsal fin, which is significantly longer and more elaborate in males.

Do Spotted Mandarins need sand in the tank?

While not strictly mandatory, a sandy substrate is highly beneficial. They often bury themselves in the sand to sleep at night or to hide when stressed, and the sand bed provides a habitat for the amphipods and copepods they hunt.

Yes, they are completely reef safe. They will not bother corals, anemones, or ornamental invertebrates, focusing solely on the microscopic crustaceans living on the rocks and substrate.

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Spotted Mandarin

Synchiropus picturatus

The Spotted Mandarin is a visually spectacular, psychedelic marine fish best known for its vibrant circular markings, yet it demands an expert level of care due to its strict dietary requirement for live copepods.

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Ideal Conditions

Temperature: 24 – 28 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.023 – 1.026 SG
Adult size: 6 – 8 cm
110L minimum for a single specimen, heavily relying on mature live rock for natural food production.: 110 litres+
Lifespan: 5 – 10 years
Diet: Carnivore (micro-predator). Requires a continuous supply of live copepods and amphipods.
Water flow: Moderate
Preferred setup: Mature reef tank with abundant live rock, numerous crevices, and preferably an established refugium to supply live pods.

About the Spotted Mandarin

Renowned for its breathtaking aesthetic, the Spotted Mandarin—often called the Psychedelic Mandarin—features an olive-green base completely covered in large, target-like spots ringed with blue, black, and orange. Belonging to the dragonet family, it lacks typical scales, instead relying on a thick, unpleasant-tasting mucus coat to deter predators and resist parasites like marine ich. They spend their days hovering meticulously over rockwork and substrate, constantly scanning for microscopic prey. While their slow, calculated movements are charming to watch, this specialised biology requires a keeper willing to fully cater to their unique lifestyle.

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Is it right for your tank?

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Where Spotted Mandarin comes from

Native range

Indo-West Pacific, Coral Triangle

Countries / regions

Philippines, Indonesia, Australia

Habitat

Shallow, protected coral reefs and coastal lagoons with sandy bottoms and rubble zones.

They are predominantly found in sheltered, shallow waters where benthic micro-crustaceans are plentiful.

Similar species

Green Mandarin
Synchiropus splendidus
Red Mandarin
Synchiropus splendidus
Scooter Blenny
Synchiropus ocellatus
Ruby Red Dragonet
Synchiropus sycorax

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Peaceful mid-water dwellers that will not compete with the Mandarin for benthic copepods.
Great
Firefish
Nemateleotris magnifica
A docile, water-column feeder that occupies a different niche and poses no threat to bottom-dwelling dragonets.
Great
Banggai Cardinalfish
Pterapogon kauderni
Slow-moving and peaceful, feeding primarily on larger zooplankton in the water column rather than hunting on the rocks.
Great
Royal Gramma
Gramma loreto
A relatively peaceful cave-dweller that may share rockwork but eats larger meaty foods, leaving the micro-fauna for the Mandarin.
Great
Six Line Wrasse
Pseudocheilinus hexataenia
An aggressive forager that will actively hunt and deplete the copepod population, potentially causing the Mandarin to starve.
Compatible with caution
Scooter Blenny
Synchiropus ocellatus
Closely related dragonets that share the exact same dietary requirements, leading to severe competition for food.
Compatible with caution
Volitan Lionfish
Pterois volitans
A large predator capable of easily swallowing a Spotted Mandarin whole, despite the dragonet's toxic slime coat.
Not recommended
Spotted Mandarin (Male)
Synchiropus picturatus
Two males housed in the same aquarium will fight relentlessly, often to the death.
Not recommended

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