Princess (Ocellate) Damselfish — Pomacentrus vaiuli

Introduction to Saltwater Damselfish

Damselfish are small, active, and highly adaptable saltwater fish commonly found in coral reefs and rocky lagoons. Known for their bright colors and bold personalities, they are one of the hardiest marine species, making them a popular choice for beginners and experienced aquarists alike. While some damselfish remain peaceful in community tanks, many species are territorial and aggressive, especially in smaller aquariums. Careful species selection and tank planning are essential when adding damselfish to a marine system.

Care Requirements

Care Level: Easy – Extremely hardy and beginner-friendly Minimum Tank Size: 30+ gallons for smaller species, 50+ gallons for more aggressive varieties Aquarium Setup: Requires plenty of live rock for territory and shelter Open swimming areas to accommodate their active nature Multiple hiding spots to reduce aggression in smaller tanks Damselfish are adaptable to a wide range of marine environments, but their territorial tendencies can increase in smaller setups. Diet & Feeding Damselfish are omnivores, consuming a mix of plankton, small invertebrates, and marine vegetation in the wild. Diet Type: Omnivorous – Prefers small meaty and plant-based foods

Recommended Foods:

High-quality marine pellets and flakes Frozen mysis and brine shrimp Algae-based foods and spirulina for herbivorous species A varied diet enhances coloration, promotes longevity, and reduces aggression in damselfish.

Lifespan & Growth Rate

Lifespan: 5-15 years Size Potential: Typically grows 2-6 inches, depending on the species With proper care and diet, damselfish can live well over a decade in captivity.

Temperament & Compatibility

Temperament: Semi-Aggressive – Can become territorial, especially in smaller tanks Reef Safe? Yes – Safe with corals and invertebrates, but may be aggressive toward other fish While damselfish are resilient and easy to keep, their territorial nature can lead to conflicts in community tanks. Providing ample hiding spaces and introducing them last in a tank setup helps reduce aggression.

Common Challenges & Considerations

Aggression Levels Vary by Species: Some damselfish remain peaceful, while others become highly territorial as they mature. Best in Larger Tanks: More space reduces territorial disputes and allows for coexistence with other fish. Difficult to Remove Once Established: Due to their speed and ability to hide in rockwork, catching a damselfish can be challenging if relocation is needed. Damselfish are hardy, beautiful, and full of personality, but their bold nature requires careful tank planning to ensure a balanced marine environment.

Color Varieties & Popular Species

Damselfish are available in a wide range of striking colors, making them one of the most visually diverse saltwater fish groups. Popular Damselfish Species: Blue Devil Damselfish (Chrysiptera cyanea) – Vivid blue with an aggressive personality Yellowtail Damselfish (Chrysiptera parasema) – Bright blue body with a yellow tail, less aggressive than other species Azure Damselfish (Chrysiptera hemicyanea) – Blue body with a yellow underbelly, adaptable and reef-safe Four-Stripe Damselfish (Dascyllus melanurus) – Black and white striped species known for its territorial behavior Garibaldi Damselfish (Hypsypops rubicundus) – Large, bright orange species that requires a much larger tank