Damselfish
Blue Devil Damselfish
Chrysiptera cyanea
Extremely hardy but territorial — keep one per tank, or a proven pair; do not add shy newcomers to an established blue devil.
Difficulty
beginner
Adult size
6–8 cm
Temperament
Semi-aggressive, territorial
Minimum tank
120+ litres
Diet
Omnivore — pellets, flakes, frozen foods
Lifespan
6–10 years
Water parameters
- Temperature75–80°F
- Specific gravity1.024–1.026
- pH8.1–8.4
Species-specific requirements override general saltwater guidelines.
Natural habitat
Coral reefs and rubble zones of the Indo-Pacific
Care notes
Nearly indestructible — which is why it outcompetes shyer tankmates. Provide rock territory to focus its aggression.
Sourcing & ethics
We list only species that can be sourced responsibly. Availability in Nepal varies — confirm current stock before planning a build.
Widely available; a hardy species often recommended as a first marine fish.
Compatibility
Good company
Keep with caution
“Caution” reflects likely aggression or predation — outcome depends on tank size, order of addition and individual temperament.