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Emperor Angelfish
Pomacanthus imperator
Animalia›Chordata›Actinopterygii›Pomacanthidae
📍 Indo-Pacific Reefs, Red Sea to Hawaii
Majestic large angelfish with electric blue-and-yellow horizontal stripes. Juveniles are black with white rings. Not reef-safe. Requires expert care and very large tanks.
Care Guide
Diet
Emperor Angelfish are omnivores with a strong preference for sponges and soft corals in the wild. Feed a varied diet of high-quality marine flakes, pellets, frozen mysis shrimp, and blanched vegetables (spirulina, nori) once daily. Supplement with sponge-based foods and occasional live foods to replicate natural feeding behavior and maintain coloration.
Behavior
Majestic and somewhat territorial, especially as they mature. Adults are semi-aggressive and will harass smaller fish and invertebrates, making them unsuitable for reef tanks. They are active swimmers that patrol all tank levels and can be curious about their environment, though they may hide during acclimation.
Breeding
Breeding Emperor Angelfish in captivity is extremely rare and virtually undocumented in home aquariums. They are open-water spawners that require massive tank volumes and specific environmental triggers unlikely to occur in captivity. Captive-bred specimens are occasionally available but wild-caught juveniles remain the norm.
Tank Mates
Hardy, similar size range, occupy different tank zones; may be nipped at but generally tolerate each other
Both large and territorial; only attempt in 180+ gallon tanks with plenty of space and hiding areas
Both angelfish; risk of aggression, only compatible in very large tanks with established territories
May be eaten when small but useful for parasite control; provide adequate hiding spots
Nocturnal and peaceful; occupy different behavioral niches, minimal competition
Common Diseases
Marine Ich (Cryptocaryon irritans)
White spots on body and fins, rapid breathing, flashing against surfaces, lethargy
Quarantine immediately; raise temperature to 28-29°C, use copper-based medications or hyposalinity treatment; maintain excellent water quality
Fin Rot
Frayed or deteriorating fin edges, discoloration at fin margins, progressive fin loss
Improve water quality and reduce stress; perform frequent partial water changes; use antibiotic treatments if secondary bacterial infection occurs
Velvet Disease (Oodinium)
Fine golden or rust-colored dust on body, rapid breathing, loss of appetite, scratching behavior
Quarantine and treat with copper medication or hyposalinity; maintain temperature at 28°C; ensure excellent aeration
Head and Lateral Line Erosion (HLLE)
Pitting or erosion of head and lateral line, loss of scales, visible grooves on head
Improve diet with quality foods, vitamin supplements, and varied nutrition; ensure excellent water quality and stable parameters
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Quick Facts
- pH
- 8.1–8.4
- diet
- omnivore/sponge
- maxSize
- 15 inches
- salinity
- 1.023–1.025 SG
- minTankSize
- 180 gallons
- temperature
- 75–81°F (24–27°C)
Temperature
75–81°F
24–27°C