Pacific Creole Anthias

The Pacific Creole Anthias (Cephalopholis colonus, formerly Paranthias colonus), also known as the Pacific Creolefish, is a large, active saltwater fish with a dramatically different appearance between juvenile and adult stages. Juveniles are typically bright yellow with a series of dark spots along the upper body, while adults develop reddish to reddish-gray coloration with greenish-brown tones, red fins, and distinctive pale blue, violet, or whitish spots across the back and caudal peduncle.

Native to the tropical eastern Pacific, this species ranges from the Gulf of California south to Peru and occurs around offshore islands including the Galápagos, Cocos, Clipperton, Malpelo, and Revillagigedo Islands. Pacific Creolefish naturally form midwater aggregations around rocky and coral reefs, where they swim above the structure and feed on plankton carried through the water column.

Reaching approximately 14 inches as an adult, this is a substantial marine aquarium fish that requires considerably more swimming room than typical anthias. Its active schooling behavior and unusual coloration make it an impressive choice for very large reef or fish-only aquariums, but its adult size and predatory potential around very small animals should be considered carefully.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 250 gallons
Temperament: Semi-aggressive
Diet: Carnivore / Planktivore
Reef Safe: With Caution
Region: Eastern Pacific – Gulf of California to Peru, including Galápagos, Cocos, Clipperton, Malpelo, and Revillagigedo Islands
Scientific Name: Cephalopholis colonus (formerly Paranthias colonus)

Tank Requirements

Provide a very large, mature marine aquarium with extensive open swimming space. Pacific Creole Anthias are powerful midwater swimmers that naturally spend much of their time above reef structure rather than remaining close to caves or the substrate.

Rockwork should provide sturdy caves, ledges, and protected retreats while leaving substantial unobstructed areas for swimming. A long aquarium footprint is especially beneficial for accommodating their adult size and continuous movement.

Moderate to strong, well-distributed water movement is appropriate and helps recreate the current-rich reef environments where these fish naturally feed. Strong oxygenation and efficient filtration are important, particularly because large specimens require frequent feeding and can contribute a significant bioload.

A securely fitted aquarium lid is recommended, especially during acclimation or when multiple active fishes are maintained together.

Diet and Feeding

The Pacific Creole Anthias is a carnivorous planktivore that naturally feeds on zooplankton and other small animal prey suspended above the reef.

Offer a varied diet including enriched mysis shrimp, krill, enriched brine shrimp, chopped shrimp, squid, clam, plankton-based frozen blends, and quality marine pellets. Smaller specimens should receive appropriately sized foods that remain suspended in the water column.

Feed two to three times daily, with multiple moderate meals preferable to a single large feeding. A varied, protein-rich diet helps maintain good body condition and coloration as the fish develops into its substantially larger adult form.

Temperament and Tankmates

Pacific Creole Anthias are social fish that naturally occur in groups, but their large adult size and energetic swimming behavior require considerable aquarium space. They are generally compatible with similarly sized peaceful to moderately assertive marine fish.

Suitable tankmates can include larger tangs, rabbitfish, angelfish, robust wrasses, and other active community species that are not small enough to be considered prey.

Very small, timid fish may be intimidated or potentially eaten by mature individuals. When keeping more than one Pacific Creolefish, provide substantially more space than the minimum aquarium size along with abundant swimming room and multiple retreat areas.

Reef Compatibility

The Pacific Creole Anthias is best considered reef safe with caution. It does not normally graze on or deliberately damage corals, making it compatible with stony and soft coral displays.

Its large adult size and carnivorous feeding behavior create some risk to very small ornamental shrimp, tiny crustaceans, and exceptionally small fishes. Larger established reef invertebrates are generally at lower risk.

For this reason, it is most appropriate for large reef aquariums where tankmates and ornamental invertebrates are selected with its eventual adult size in mind.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Maintain stable, well-oxygenated water with strong filtration and consistent nutrient management. Large, active specimens fed several times daily can place considerable demands on aquarium filtration. Stability is more important than targeting one exact value within these ranges.

Common Considerations

• Large adult size: Can reach approximately 14 inches and requires a very large aquarium with extensive swimming room.

• Dramatic color change: Bright yellow juveniles develop substantially different reddish and greenish adult coloration as they mature.

• Active midwater swimmer: Requires generous open water rather than a densely packed aquascape.

• Frequent feeding: Benefits from multiple meals of nutritious planktonic and meaty marine foods throughout the day.

• Predatory potential: Very small fish and ornamental crustaceans may be at risk from mature individuals.