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Blue Devil Damselfish
Chrysiptera cyanea
One of the hardiest and most colorful marine fish, with an electric blue body. Extremely tough and adaptable — ideal for cycling new marine tanks. Can be territorial.
Care Parameters
Adult size
7 cm
Min tank
60 L
Temperature
24–28°C
pH
8.1–8.4
GH
8–12 dGH
Diet
Omnivore
Temperament
Semi-aggressive
Water zone
All levels
Difficulty
Beginner
Schooling
Groups or solitary.
Suitable Equipment
5
Common Problems
5F
Fish Gasping at Surface
Fish hover at the surface, breathing rapidly. A possible oxygen emergency.
fishC
Cloudy Water
Milky or hazy water that never fully clears.
waterH
High Ammonia Poisoning
Elevated ammonia levels cause burns, redness and rapid breathing.
waterD
Dropsy
Abdomen swells and scales stand out like a pinecone — usually a bacterial infection.
fishO
Old Tank Syndrome
Water quality slowly worsens over months or years despite regular small water changes.
water