Chrysiptera starcki (Starck’s Damselfish / Starck’s Demoiselle)
• Small fish safe: ✅ Yes
• Small invert safe: ✅ Yes
• Coral safe: ✅ Yes
• Minimum tank size: 115L+ (preferably 150L+ for groups)
• Adult size: ~9 cm (3.5 inches)
• Diet: Omnivorous (marine pellets, frozen mysis/brine shrimp, algae-based foods)
• Be aware of: Less aggressive than many other damselfish, but still defends a small territory. Juveniles are peaceful, but adults may become slightly territorial in confined spaces. Best kept singly or in groups to disperse aggression.
Starck’s Damselfish (Chrysiptera starcki) – A Vibrant and Hardy Reef Fish
The Starck’s Damselfish, also known as the Starck’s Demoiselle, is a striking and relatively peaceful species within the damselfish family. Unlike some of its more aggressive relatives, C. starcki is mild-mannered and social, making it an ideal choice for community reef tanks. Its hardy nature, vibrant coloration, and manageable temperament make it a great option for both beginner and experienced aquarists.
Appearance and Coloration
Starck’s Damselfish is easily recognizable due to its:
• Brilliant electric blue body, which shimmers under aquarium lighting.
• Bright yellow dorsal region, extending from the head to the tail.
• Compact, elongated body shape, reaching up to 9 cm (3.5 inches) in length.
This bold contrast of blue and yellow makes Starck’s Damselfish a standout addition to reef aquariums.
Natural Habitat and Behavior
Native to the western Pacific, including areas from the Ryukyu Islands and Taiwan to Australia, New Caledonia, and Tonga, Starck’s Damselfish inhabits deeper reef slopes and outer reef areas, where they:
• Live among crevices in rocky areas, using them for protection.
• Prefer depths up to 60 meters (197 feet), often found in outer reef areas.
• Form pairs during breeding, with males guarding and tending to the eggs.
• Feed on plankton, including both zooplankton and phytoplankton.
In captivity, they maintain their active and inquisitive nature, making them engaging inhabitants in reef tanks.
Tank Requirements and Water Parameters
Due to their active nature, Starck’s Damselfish require a well-structured aquarium with adequate space and hiding spots.
• Minimum tank size: 115L+ (150L+ recommended for groups or community tanks)
• Temperature: 22–25.5°C (72–78°F)
• pH: 8.1–8.4
• Salinity: 1.020–1.025
• Water movement: Moderate to strong
• Filtration: Good filtration and regular water changes to maintain stable water conditions.
Providing plenty of live rock and coral structures allows them to feel secure and helps reduce minor territorial disputes.
Diet and Feeding
Starck’s Damselfish are omnivorous and require a balanced diet for vibrant coloration and overall health.
Recommended foods include:
• Frozen mysis and brine shrimp – Provides protein.
• High-quality marine pellets and flakes – Look for color-enhancing formulas.
• Algae-based foods and spirulina – Supports digestion and coloration.
• Finely chopped seafood (shrimp, squid, or fish) – Occasional protein treats.
Feed once or twice daily, ensuring a mix of protein and plant-based foods to maintain their health and coloration.
Compatibility and Tank Mates
Starck’s Damselfish are one of the more peaceful damselfish, making them a great addition to community tanks.
✔ Peaceful and semi-aggressive tank mates, such as Clownfish, Firefish, Wrasses, and Blennies.
✔ Larger, non-aggressive fish, which can hold their own in community setups.
✔ Reef-safe invertebrates, including shrimp, snails, and crabs.
Avoid housing with:
❌ Highly aggressive fish, such as large Dottybacks or aggressive Triggerfish.
❌ Overly dominant damselfish species, which may intimidate them.
❌ Very small, delicate fish, which may be outcompeted for food.
⚠ If keeping multiple Starck’s Damselfish, introduce them as a group to reduce territorial behavior.
Behavior and Social Structure
Unlike other damselfish, Starck’s Damselfish:
• Are much more peaceful, rarely instigating aggression.
• Tend to hover near rockwork or coral, rather than darting aggressively.
• Defend a small personal space, but are not territorial bullies.
⚠ If kept in a small tank, they may become territorial. Keeping them in larger aquariums with good hiding spots helps prevent disputes.
Health and Disease Considerations
Starck’s Damselfish are extremely hardy, but they can be vulnerable to:
• Marine Ich (Cryptocaryon irritans) – Often caused by stress or poor water quality.
• Bacterial infections – Can occur from territorial disputes or injuries.
• Nutritional deficiencies – A varied diet helps prevent color fading and immune issues.
To keep them healthy:
✔ Provide a balanced diet with a mix of protein and plant-based foods.
✔ Ensure stable water conditions with proper filtration.
✔ Quarantine new fish before introducing them to the main tank.
Lifespan and Long-Term Care
With proper care, Starck’s Damselfish can live up to 5-6 years in captivity. Their resilient nature, mild temperament, and vibrant coloration make them a great addition to well-planned reef tanks.
Why Choose a Starck’s Damselfish?
✔ One of the most peaceful damselfish, making it ideal for community tanks.
✔ Hardy and beginner-friendly, adapting well to various conditions.
✔ More social than most damselfish, making them easier to house with other fish.
✔ Completely reef-safe, with no risk to corals or invertebrates.
✔ Long lifespan, making them a great long-term addition to aquariums.
⚠ Important Considerations Before Buying a Starck’s Damselfish:
🚫 Can become mildly territorial, but much less so than other damselfish.
🚫 Best kept in groups or singly, to minimize aggression.
🚫 Needs hiding spots, to feel secure in a community setting.