Saltwater Fish
Gray Angelfish

Species Description…

Scientific Name: Pomacanthus arcuatus
Common Name: Gray Angelfish
Species Group: Angelfish
Habitat: Reef Safe with Caution
Care Level: Intermediate
Temperament: Semi-aggressive
Diet Type: Omnivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 24 (inches)
Min Aquarium Size: 250 (gallons)
Native Range: Western Atlantic, from the U.S. to Brazil, including the Caribbean
Pomacanthus arcuatus - Gray Angelfish

Pomacanthus arcuatus (Gray Angelfish)

Overview

  • Native to the Western Atlantic, commonly found near coral reefs and rocky outcroppings in the Caribbean and Gulf of Mexico.
  • Large angelfish with a dark gray body covered in lighter scale markings and a broad, crescent-shaped tail fin.
  • Juveniles feature a striking black body with yellow stripes, transitioning into adult coloration as they mature.
  • Recommended for experienced aquarists due to their large size and territorial nature.

Feeding

  • Omnivorous; natural diet includes sponges, algae, and small invertebrates.
  • In captivity, feed a varied diet of marine algae, spirulina, mysis shrimp, brine shrimp, and angelfish-specific preparations containing sponge material.
  • Feed 2–3 times daily to support growth, coloration, and vitality.
  • Dietary variety is important to meet their nutritional needs and prevent dietary deficiencies.

Habitat

  • Requires a large, well-established aquarium (minimum 180 gallons) with ample swimming space and live rock structures.
  • Provide caves, overhangs, and rockwork for hiding and grazing behavior.
  • Stable water parameters and high water quality are essential for long-term health.
  • Moderate water flow and strong filtration help maintain ideal conditions.

Fish Care

  • Preferred water temperature: 74–80°F (23–27°C).
  • Recommended pH level: 8.1–8.4; specific gravity: 1.020–1.025.
  • Sensitive to poor water conditions and prone to marine ich; regular maintenance and observation are critical.
  • Quarantine new arrivals and avoid sudden changes in parameters.

Compatibility

  • Semi-aggressive; may be territorial, especially toward other angelfish or similarly shaped species.
  • Not reef-safe; known to nip at corals, sponges, and small invertebrates.
  • Compatible tank mates include large tangs, wrasses, and other robust marine fish.
  • Best kept singly unless housed in a very large aquarium with ample space and hiding areas.

Aquarium Behavior

  • Active and bold swimmer, often seen patrolling the aquarium and grazing on algae.
  • May become territorial as it matures, especially in confined spaces.
  • Displays intelligent behavior and recognizes caretakers during feeding times.
  • Providing environmental enrichment and a varied diet encourages natural, healthy behaviors.