Luzon Anthias - Male

The male Luzon Anthias (Pseudanthias luzonensis), also known as the Yellowlined Anthias, is a beautifully patterned saltwater fish distinguished by its orange-red head and upper body, pink coloration toward the rear, and lighter underside. Mature males develop distinctive yellow to reddish-orange broken lines along the sides, a prominent red marking on the dorsal fin, an elongated third dorsal spine, and a deeply shaped tail with short filamentous tips. These intricate markings give the male a particularly refined appearance in a brightly illuminated reef aquarium.

Native to the western Pacific, the Luzon Anthias occurs from southern Japan through the Philippines and Indonesia to Australia and eastward toward Vanuatu. It inhabits coastal reefs and deeper reef slopes, commonly at depths of approximately 30 to 150 feet, where small aggregations swim above reef structure and capture planktonic foods from the current.

Reaching nearly 6 inches as an adult, the male Luzon Anthias is an active marine aquarium fish that benefits from generous swimming room, strong water quality, and frequent feeding. It is an excellent choice for established reef aquariums and appropriately sized fish-only systems, although males can become territorial toward other anthias as they establish dominance.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 90 gallons
Temperament: Semi-aggressive
Diet: Carnivore / Planktivore
Reef Safe: Yes
Region: Western Pacific – Japan, Philippines, Indonesia, Australia, and Vanuatu
Scientific Name: Pseudanthias luzonensis

Tank Requirements

Provide a mature, well-established marine aquarium with substantial open swimming space above and around the rockwork. Luzon Anthias are active water-column swimmers and benefit from a long aquarium footprint that allows unrestricted movement throughout the day.

Arrange live rock to provide caves, ledges, overhangs, and shaded retreats without excessively reducing open water. These protected areas provide nighttime shelter and allow the fish to withdraw from territorial interactions or more assertive tankmates.

Moderate to strong, well-distributed water movement is appropriate and helps reproduce the current-rich reef environments where this species naturally feeds. Good oxygenation and efficient filtration are important because the frequent feeding required by anthias can increase nutrient input.

A securely fitted mesh screen or aquarium lid is recommended, as anthias may jump when startled or chased.

Diet and Feeding

The Luzon Anthias is a carnivorous planktivore that naturally feeds on small zooplankton and crustaceans suspended in the water column.

Offer a varied diet including enriched mysis shrimp, enriched brine shrimp, copepods, calanus, frozen plankton blends, finely chopped marine seafood, and appropriately sized high-quality marine pellets or flakes. Foods that remain suspended in the water column encourage natural feeding behavior.

Feed two to three small meals per day, with additional small feedings beneficial when practical. Newly introduced specimens may initially respond most readily to frozen plankton, copepods, mysis shrimp, and other small moving foods.

Temperament and Tankmates

Male Luzon Anthias are generally compatible with peaceful to moderately assertive marine fish but can become territorial toward other anthias. Mature males may display, chase subordinate individuals, or defend their position within an established social group.

Suitable tankmates include clownfish, gobies, blennies, fairy and flasher wrasses, tangs, peaceful angelfish, and other non-predatory community species.

Avoid keeping multiple mature males together unless the aquarium is exceptionally large and provides substantial separation between territories. A single male can be maintained successfully, or one male may be kept with several compatible females in a larger aquarium.

Like other anthias, this species has a socially structured reproductive system in which females may transition into males when the dominant male is absent.

Reef Compatibility

The male Luzon Anthias is considered reef safe and is an excellent addition to coral-dominated aquariums. It does not normally consume or damage stony corals, soft corals, clams, or other sessile reef organisms.

It is also generally compatible with ornamental shrimp, crabs, snails, and other established reef invertebrates. Tiny copepods and other planktonic crustaceans may naturally be consumed as part of its normal feeding behavior.

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 consistently high water quality. Efficient filtration and nutrient management are especially important because this species benefits from multiple feedings each day. Stability is more important than targeting one exact value within these ranges.

Common Considerations

• Adult size: Can reach approximately 5.5–6 inches and requires generous open swimming space.

• Male coloration: Mature males develop orange-red and pink coloration with distinctive broken yellow-to-red lines and an elongated dorsal spine.

• Male territoriality: May display or chase other anthias, particularly competing males.

• Frequent feeding: Benefits from multiple small meals of plankton-sized, protein-rich foods throughout the day.

• Deeper-reef origin: Provide excellent water quality, strong oxygenation, secure retreats, and a stable aquarium environment.