Saltwater Fish
Princess Damselfish

Species Description…

Scientific Name: Pomacentrus vaiuli
Common Name: Princess Damselfish
Species Group: Damselfish
Habitat: Reef Safe
Care Level: Beginner
Temperament: Semi-aggressive
Diet Type: Omnivore
Role in Aquarium: Community Fish
Max Fish Length: 3.5 (inches)
Min Aquarium Size: 30 (gallons)
Native Range: Indo-Pacific
Pomacentrus vaiuli - Princess Damselfish

Pomacentrus vaiuli (Princess Damselfish)

Overview

  • Native to the Indo-Pacific, commonly found in coral-rich lagoons and outer reef slopes.
  • Small, vibrant fish with a striking combination of electric blue and purple hues, often with subtle spots or lines on the body.
  • Hardy and active, making it a popular choice for beginner to intermediate aquarists.
  • Can be territorial, especially in smaller tanks or when kept with more docile species.

Feeding

  • Omnivorous; naturally consumes algae, plankton, and small invertebrates.
  • Readily accepts marine flakes, pellets, mysis shrimp, brine shrimp, and spirulina-based foods.
  • Feed 2–3 times daily to support vibrant coloration and activity levels.
  • A varied diet helps ensure proper nutrition and overall health.

Habitat

  • Suitable for aquariums 30 gallons or larger, with plenty of rockwork and coral structures.
  • Enjoys areas with hiding places, caves, and branching corals for refuge.
  • Stable water parameters and good water quality are essential.
  • Moderate water flow and efficient filtration recommended for optimal conditions.

Fish Care

  • Ideal water temperature: 74–80°F (23–27°C).
  • pH level: 8.1–8.4; specific gravity: 1.020–1.025.
  • Hardy, but regular maintenance and water changes are necessary to avoid stress-related illness.
  • Quarantine new arrivals to prevent disease introduction into the display tank.

Compatibility

  • Semi-aggressive; can be territorial, especially in confined environments.
  • Reef-safe; does not typically harm corals or invertebrates.
  • Best kept with other semi-aggressive fish or in species-only tanks for minimal conflict.
  • Avoid housing with very passive species or much larger aggressive fish.

Aquarium Behavior

  • Highly active swimmer and often seen darting in and out of rockwork or coral heads.
  • May stake out a territory, especially during feeding or when threatened.
  • Interactive and responsive to aquarists, particularly during feeding time.
  • Providing a well-structured aquascape helps promote natural behavior and reduce aggression.