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Cardinalfish Banggai Original price was: $64.95.Current price is: $58.95.

Damselfish Blue Devil

  • Striking blue fish, fiery on males.
  • Lively & territorial, needs a large tank.
  • Easy care, but better for reef experts.
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SKU: 5016

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The Electric Blue Devil: A Damselfish with Personality

The Blue Devil Damselfish (Chrysiptera cyanea) is a vibrant saltwater fish that injects a splash of color into any reef tank. This energetic little fish is a popular choice for aquarists due to its hardiness and striking appearance.

Scientific Name: Chrysiptera cyanea

Bringing the Blue Devil Home: Habitat Needs

  • Water Quality: Maintain pristine water conditions with a mature reef tank setup. Regular water changes and a good protein skimmer are essential.
  • pH Level: 7.8 – 8.4 (slightly alkaline)
  • GH Level: 8 – 12 dGH
  • KH Level: 8 – 12 dKH (Provides carbonate stability)

Feeding Your Blue Devil

These omnivores are not picky eaters. Offer a varied diet of:

  • Meat-based foods: Brine shrimp, Mysis shrimp, chopped frozen seafood
  • Herbivore preparations: Spirulina flakes, seaweed sheets
  • Flake foods: May be accepted, but not a staple

Tank Mates: Sharing the Reef

Blue Devils are known to be territorial and can be aggressive towards tank mates. Here’s who they might get along with:

  • Larger fish: Angelfish, Butterflyfish, Tangs (avoid similar-sized or shy fish)
  • Invertebrates: Generally reef safe with corals and invertebrates (coral polyps may be nipped at)

Décor Ideas for a Happy Blue Devil

  • Substrates: Live sand beds allow for natural scavenging
  • Tank Decorations: Live rock provides hiding places and grazing opportunities
  • Suitable Plants: Can be kept with hardier macroalgae species

Not the Best Plant Choices: Softer corals and leafy plants may be seen as a food source.

Sexing and Breeding Blues

Distinguishing Sex: Males develop a yellow or orange patch on their tail fin as they mature.

Breeding: Not recommended for home aquariums. They readily spawn in mature reef tanks, but raising the fry is challenging.

Living the Blue Devil Dream

  • Maximum Size: Up to 3 inches
  • Longevity: 3-5 years with proper care

A Spirited Resident

Blue Devils are active swimmers and will constantly explore their territory. They can be bold and may nip at the fins of slower fish.

Before You Bring Home Your Blue Devil

  • Research Compatibility: Double-check tank mate suitability before introducing your Blue Devil.
  • Tank Size: They require a minimum of 30 gallons due to their territorial nature.
  • Experienced Aquarist: While relatively hardy, their temperament is better suited for those comfortable with maintaining a reef tank.

Generally Speaking…

Blue Devils are a beautiful addition to a well-established reef tank. Their electric blue color and lively personality make them a captivating fish.

Fun Fact!

Blue Devils can change their color to almost black when stressed or threatened. This helps them blend in with the reef for protection.


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Care Level


Potential of Hydrogen

pH Level Aquarium pH measures water acidity/alkalinity. 7 is neutral. Fish have pH preferences; maintain ideal levels for their health and stability.

7.8 – 8.4

General Hardness

GH Level GH (General Hardness) in aquariums measures minerals like calcium and magnesium. It affects fish health by showing water\'s mineral content.

8 – 12 dGH

Carbonate Hardness

KH Level KH (Carbonate Hardness) in an aquarium stabilizes pH. It acts like a shield, keeping the water conditions just right for fish.

8 – 12 dKH


Temperature Ideal temperature needed for fish

24°C – 26°C

How long will I live

Life Span

3 – 5 Years

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