Fan Bellied Filefish
Monacanthus chinensis
| Stock | Variations | Price | Quantity |
|---|
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Monday – Friday 8 AM – 9 PM
Saturday 12 PM – 4 PM
Sunday 12 PM – 9 PM
Healthy, stable animals from vetted suppliers — inspected before packing, shipped overnight. Decades of experience built this model so we can deliver premium livestock at 30%+ less than you'd pay elsewhere.
| Care Level | Moderate |
|---|---|
| Temperament | Peaceful |
| Reef Safe | With Caution |
| Functional Benefit | Algae Control |
| Diet Type | Omnivore |
| Mininum Tank Size | 180 gallons |
| Max Size | 18 inches |
| Temperature | 72–78°F |
| pH Range | 8.1–8.4 |
| Specific Gravity | 1.022–1.025 |
The Fan Bellied Filefish (Monacanthus chinensis) is an active grazer that spends the day picking at rockwork and algae-coated surfaces, making it a useful addition for natural algae control. It has a mottled tan-and-brown pattern, an upturned snout, and a distinct “fan” of skin along the belly that helps set it apart from other leatherjacket filefish. Native to the Indo-Pacific, it’s also known for shifting its coloration to better match its surroundings.
What You’ll Observe:
- Cruising the tank with a trigger-like fin “hover” swimming style
- Frequent pecking at rocks, film algae, and encrusting growth
- Color changes through the day as it moves between sand and rock areas
- Quickly learning feeding routines and coming out for prepared foods
For best results, provide a mature aquarium with plenty of established rockwork and grazing surfaces, plus open room to move between structures. Offer a varied menu of meaty frozen foods alongside algae-based options like dried seaweed to keep feeding consistent. Consistent access to natural picking areas and regular meals supports steady, confident behavior.
Is this the same fish as the “aiptasia-eating filefish”?
It’s often confused with (or mislabeled as) an aiptasia-focused filefish. Some keepers report it will eat aiptasia, while others see it ignore aiptasia entirely.
Why does it change color (and sometimes show bluish patches)?
This species can shift its patterning to blend with different backgrounds. Keepers commonly notice it darken near rock or mussel-like textures and lighten over sand.
Will it eat cleaner shrimp, porcelain crabs, or other crustaceans?
Hobbyist reports are mixed, but filefish behavior can include opportunistic hunting of crustaceans they can catch. Larger or more defensive shrimp may be left alone, especially in a well-fed tank.
How can you sex a Fan Bellied Filefish?
Sexing is not always clear in juveniles. Some hobbyists report mature males may show noticeable bristles on the caudal peduncle (the area just before the tail).
Does it need macroalgae in the tank to do well?
It typically spends a lot of time browsing and picking throughout the day, and many keepers like to supplement that with algae-based foods. Offering seaweed on a clip can help keep its grazing behavior directed to easy, consistent feeding spots.
We work with trusted suppliers who keep our specimens healthy and well-fed before shipping.
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