Clarion Angelfish

The Clarion Angelfish (Holacanthus clarionensis) changes markedly as it grows. Narrow blue bars cross the orange flanks of a juvenile. Those bars gradually disappear, and the broad orange body and tall, rounded profile become the most conspicuous features of a mature fish.

In the eastern Pacific, this angelfish spends much of its time around rocky reefs. An established aquarium can offer the same combination of shelter and open space. Watch a settled fish move along a rock face: it can stop to pick at a surface, turn sideways to inspect a crevice, and slip under a ledge when approached.

An adult can reach approximately 12 inches (30 cm). Plan for at least 180 gallons, including room for the adult to turn between rocks and pass its tankmates. A juvenile may use a small crevice today and need a much broader shelter as it grows.

Quick Care Guide

Care Level: Difficult
Minimum Tank Size: 180 gallons
Adult Size: Up to approximately 12 inches (30 cm)
Temperament: Semi-aggressive
Diet: Omnivore
Reef Safe: No
Region: Eastern Pacific
Scientific Name: Holacanthus clarionensis

Tank Requirements

Build the aquascape around a clear swimming route and several substantial retreats. Rock islands with passages between them give the angelfish a choice of routes through the display. Allow enough clearance around each island for a deep-bodied adult to turn without rubbing its fins.

Provide at least one shaded shelter that accommodates the entire fish. A second entrance lets it leave if another resident occupies the first opening. Secure large rocks on a stable base and leave room behind them to remove food and detritus.

Established rock surfaces provide grazing opportunities between meals. Preserve a mixture of exposed faces and shaded crevices. Keep the strongest pump discharge away from the sleeping shelter and provide enough circulation elsewhere to carry food and waste out of dead spots.

Diet and Feeding

The Clarion Angelfish is an omnivore that browses attached organisms. Offer both marine algae and animal foods. A fish may spend hours investigating the rocks, so check that it also takes prepared foods and maintains a full, even body profile.

Rotate sponge-containing marine angelfish preparations, spirulina foods, sheets of marine algae, mysis shrimp and finely chopped marine seafood. Secure algae near a familiar grazing route. Offer frozen food in pieces the fish can take in one bite, particularly while a small juvenile is learning the feeding routine.

Offer several small meals over the day. In a community display, feed in two places and watch which fish actually swallows each portion. If a new arrival hangs back until food is gone, deliver a small amount beside its retreat. Remove leftover seafood from crevices after feeding.

Temperament and Tankmates

A settled Clarion Angelfish can become territorial, especially around similar-looking angelfish. In a display near the minimum recommended volume, plan for one large angel. Choose companions that can comfortably reach food alongside it and have their own resting areas.

Observe introductions at feeding time and again when fish return to their shelters. A brief display at a cave entrance differs from repeated pursuit across the tank. A fish that stays behind equipment or misses several meals may have lost access to both shelter and food.

Arrange visual barriers so a resident cannot watch every entrance from one spot. Check compatibility again as the angelfish matures. A combination that works while the fish is small can change as it begins to defend a larger area.

Reef Compatibility

Treat the Clarion Angelfish as non reef safe. Its grazing habit can bring it into repeated contact with coral polyps, ornamental sponges and clam mantles. A fish-only aquarium with live rock provides surfaces to explore without putting those animals within reach.

An individual may ignore a coral for a time and later return to the same patch repeatedly. Persistent retraction, localized tissue damage or a clam that closes whenever the fish approaches are reasons to separate the animals. Regular feeding supports the fish but cannot guarantee coral compatibility.

Water Parameters

Temperature: 72–78°F
Specific Gravity: 1.023–1.025
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Maintain stable salinity, good oxygenation and undetectable ammonia and nitrite. Frequent feeding increases the load on filtration. Check mechanical filters and sheltered areas where scraps settle, particularly after increasing portions for a growing fish.

Keep the daily lighting and feeding schedule predictable during introduction. When moving the angelfish, use a suitably sized specimen container where practical. The spine on each gill cover can snag in mesh.

Common Considerations

• Changing coloration: The blue juvenile bars fade with growth. The amount of blue visible on arrival varies with the individual.

• Adult housing: Allow at least 180 gallons and arrange shelter for a fish up to approximately 12 inches long.

• Feeding access: Observe the fish swallowing food, especially when quicker tankmates gather at the same spot.

• Stock listing: Individual coloration and pattern vary. Listed sizes are approximate.