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Moorish Idol
Zanclus cornutus
Animalia›Chordata›Actinopterygii›Acanthuriformes›Zanclidae
📍 Indo-Pacific & Eastern Pacific
One of the most iconic reef fish — striking black, white, and yellow pattern with an elongated dorsal filament. The fish inspiration for Gill in Finding Nemo. Notoriously difficult to keep long-term as it specialises on sponges; most slowly starve in captivity.
Care Guide
Diet
Moorish Idols are obligate sponge specialists, making them extremely difficult to feed in captivity. They require live sponges, sponge-based prepared foods, or high-quality frozen sponge products fed once daily. Most specimens slowly starve despite best efforts, as they rarely accept standard aquarium foods like flakes, pellets, or frozen mysis shrimp.
Behavior
Moorish Idols are generally peaceful and non-aggressive toward other fish, though they are somewhat shy and reclusive. They spend much of their time grazing and exploring the reef, moving deliberately through mid-water zones. They are best kept singly or in bonded pairs, as they can become stressed in crowded conditions.
Breeding
Breeding Moorish Idols in captivity is extremely rare and has not been reliably documented in home aquariums. They require very specific environmental conditions and larval rearing protocols that are difficult to replicate. Virtually all specimens in the hobby are wild-caught, making captive breeding essentially impossible for hobbyists.
Tank Mates
Peaceful reef fish with similar water requirements; both prefer calm reef environments
Non-aggressive and compatible with peaceful reef inhabitants
Small, peaceful goby that occupies different reef zones and poses no threat
Peaceful bottom-dweller that won't compete for food or space
Beneficial symbiotic relationship; shrimp may help remove parasites from Moorish Idol
Common Diseases
Parasitic Infections (Ich, Marine Velvet)
White spots, rapid breathing, lethargy, rubbing against rocks, loss of appetite
Quarantine immediately; use copper-based treatments or hyposalinity therapy; maintain pristine water quality and temperature stability
Starvation/Nutritional Deficiency
Rapid weight loss, sunken belly, lethargy, fading coloration, refusal to eat
Provide live sponges or sponge-based foods; offer varied frozen foods; consider species-specific supplements; this is the primary cause of death in captivity
Bacterial Infections
Fin rot, open sores, cloudy eyes, behavioral changes, loss of appetite
Improve water quality; perform frequent water changes; use broad-spectrum antibiotics if necessary; maintain optimal salinity and temperature
Stress-Related Illness
Hiding, color fading, erratic swimming, susceptibility to other diseases
Minimize tank disturbances; provide adequate hiding spots; maintain stable water parameters; avoid aggressive tank mates
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Quick Facts
- pH
- 8.1–8.4
- diet
- sponge specialist/difficult to feed
- maxSize
- 9 inches
- salinity
- SG 1.020–1.025
- minTankSize
- 100 gallons
- temperature
- 75–82°F (24–28°C)
Temperature
75–82°F
24–28°C