Orange spotted Filefish

Orange spotted Filefish
Quick Facts :: Orange spotted Filefish (Oxymonacanthus longirostris)
Care Level: Expert
Temperament: Peaceful
Maximum Length: 5″
Minimum Aquarium: 90L
Reef Compatible: No
Water Conditions:

22-27C, ph 8.1-8.4, sg 1.020-1.025

Diet: Carnivore
Range: Indo-Pacific
Family: Monacanthidae
Species: Filefish


Orangespotted Filefish

The Orangespotted Filefish, also known as the Harlequin Filefish, is possibly the most beautiful filefish species within the hobby.  Orangespotted Filefish typically live as pairs and small groups.  They inhabit lagoons and tropical coral reefs throughout the Indo-Pacific. Orangespotted Filefish are blue-green all over the body overlayed by a series of yellow-orange spots and blotches. Orangespotted Filefish also have green eyes rimmed in yellow-orange contrasted by light, blue-green radial striping.  They have a dark ventral “trigger” area peppered with a smattering of tiny, white to light blue-green spots.  The caudal fin is decorated with a black blotch.  Orangespotted Filefish are a magnificent species.

Orangespotted Filefish need an aquarium of 110 litres minimum, sand to crushed-coral substrate, and a generous amount of live rock for refuge. They do best in an established aquarium with stable water conditions.  Provide high quality, biological and mechanical filtration, including a protein skimmer. They coexist with many other tank mates peacefully, yet cannot be housed with aggressive fish that harass them.  Orangespotted Filefish are known to be obligatory corallivores of SPS (small polyp stony) corals and are difficult fish for reef systems. They will require the presence of SPS corals initially until they accept other food.   Orangespotted Filefish are not safe with small invertebrates such as tiny ornamental shrimp species. Orangespotted Filefish is best in a “nano” environment or a larger system.  However, they have been reported to thrive in large SPS reef tanks without noticeable damage.

Orangespotted Filefish initially feed as obligatory corallivores, a strict diet of only coral.  They typically only consume Acropora and Montipora coral species.  In some cases, however, some hobbyists have observed Orangespotted Filefish eating hair algae, frozen brine shrimp and frozen mysis shrimp (both vitamin-enriched). Orangespotted Filefish species must always be introduced slowly into an established aquarium that already contains Acropora or Montipora coral colonies.  This provides your Orangespotted Filefish their natural food source until weaned towards live “gut-load” with a variety of different, quality flake and prepared foods, frozen, and vitamin-enriched meaty foods such as brine shrimp and mysis shrimp. Orangespotted Filefish will eventually accept other prepared omnivore foods, such as quality flakes and pellets. Once completely weaned from SPS corals, feed Orangespotted Filefish several small meals a day to insure they are getting enough to eat, but only what they will consume in 2-3 minutes.


For more information please call 02 9570 4646 or

Email us:

Hurstville Aquarium


3/110 Queens Road
Hurstville NSW 2220, Australia
Phone: (02) 9570 4646