Blue Damsel - Pomacentrus coelestis
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The Blue Damsel (Pomacentrus coelestis), also known as the Blue Devil Damselfish, is a small, vibrant reef fish prized for its striking electric blue coloration and lively personality. Hardy and active, this damsel adds color and motion to the mid-water column of reef aquariums.
Common Name: Blue Damsel
Scientific Name: Pomacentrus coelestis
Family: Pomacentridae
Size: Up to 2.5 inches (6 cm)
Temperament: Semi-aggressive
Difficulty: Easy
Reef Safe: With Caution
Native Region: Found throughout the Indo-Pacific, including Indonesia, the Philippines, and the Great Barrier Reef, typically inhabiting coral-rich lagoon and reef slopes.
Tank Size: Minimum of 20 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate/Decor: Live rock and open swimming areas; provides hiding places among coral or rock crevices.
• Behavior: Semi-aggressive; may defend territory, especially in smaller tanks.
• Diet: Omnivorous—accepts flakes, pellets, and frozen foods such as mysis or brine shrimp.
• Tankmates: Best kept with other semi-aggressive or similarly sized fish; avoid very docile species that may be harassed.
• Care Needs: Hardy and adaptable, ideal for beginners, but ensure adequate hiding spaces to reduce stress.