Blue Ring Angelfish - Pomacanthus annularis
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The Blue Ring Angelfish, also known as the Annularis Angelfish or Blue King Angelfish, is a striking and majestic species recognized by its vivid blue rings and golden body. Highly sought after for large marine aquariums, this angelfish makes a bold centerpiece but requires ample swimming space and proper care due to its size and temperament.
Description:
Common Names: Blue Ring Angelfish, Annularis Angelfish, Blue King Angelfish
Scientific Name: Pomacanthus annularis
Family: Pomacanthidae
Size: Up to 12 inches (30 cm)
Temperament: Semi-aggressive
Difficulty: Moderate to Difficult
Reef Safe: With caution
Native Region:
Widespread throughout the Indo-Pacific, particularly in lagoons and outer reef slopes where it inhabits rocky and coral-rich environments.
Aquarium Setup:
Tank Size: Minimum of 180 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.1–8.4
Salinity: 1.023–1.025
Decor: Live rock for grazing and hiding places; requires open swimming space and stable water parameters.
Additional Tips:
• Diet: Omnivorous—feed a varied diet of marine algae, spirulina, high-quality angelfish preparations, mysis, and sponge-based foods.
• Behavior: May nip at soft corals, clams, and stony corals—best kept in a fish-only with live rock (FOWLR) setup if corals are a concern.
• Tankmates: Suitable with other large semi-aggressive fish; avoid housing with other large angelfish unless in an extremely spacious aquarium.
• Growth: Reaches a large size and should be added only to well-established, spacious aquariums.
• Juvenile Coloration: Juveniles display dark blue to black bodies with bold electric-blue and white concentric rings, transitioning into the golden adult form with distinctive blue rings as they mature.