Caerulean Damsels

Species Overview

• Common name: Caerulean Damsel

• Scientific name: Pomacentrus caeruleus

• Origin: Indo-Pacific reefs (Indonesia, Philippines, northern Australia)

• Adult size: 6–8 cm (2.5–3")

• Lifespan: 3–5 years in captivity

🌈 Appearance

• Body color: Bright electric blue (caerulean) with slight lighter underbelly.

• Fins: Blue dorsal, anal, and caudal fins; sometimes slightly translucent at the edges.

• Juveniles: Similar coloration but may be slightly paler.

• Vibrant coloration makes it a striking addition to nano or reef tanks.

🏞 Tank Requirements

• Tank size: Minimum 60–80L (16–21 gallons) for a single fish; larger for multiple.

• Water parameters:

  • Temperature: 24–28 °C

  • pH: 8.1–8.4

  • Salinity: 1.020–1.025 SG

• Aquascape: Plenty of rockwork or coral rubble for hiding and establishing territory.

• Suitable for reef or fish-only tanks.

🍽 Diet

• Omnivorous: small zooplankton, copepods, and algae in the wild.

• In captivity: accepts frozen mysis, brine shrimp, finely chopped seafood, and high-quality flake/pellet food.

• Feed 2–3 times daily for optimal health and coloration.

👫 Behavior & Compatibility

• Semi-aggressive; may defend a small territory in the tank.

• Compatible with other peaceful reef fish, but avoid very timid or small species that could be harassed.

• Best kept in pairs or small groups in larger tanks to reduce territorial stress.

🐣 Breeding

• Rarely bred in home aquariums; mostly wild-caught.

• Spawning occurs in small crevices or among coral rubble in the wild.

⚡ Key Selling Points

• Stunning vibrant blue coloration that stands out in nano and reef tanks.

• Hardy and adaptable for reef beginners and experienced aquarists alike.

• Small size and peaceful-to-semi-aggressive nature make it versatile for community marine tanks.