Black Cardinal (Captive Bred)

Also known as Black Cardinalfish, Dusky Cardinalfish

The Black Cardinal is a striking yet understated marine fish, displaying a uniform deep charcoal-black to dark brown coloration that adds dramatic contrast and a refined, minimalist elegance to reef aquariums. Unlike brightly colored cardinalfish, this species stands out through its shadowy presence and subtle beauty. Peaceful, shy, and primarily nocturnal, the Black Cardinal is an excellent choice for aquarists seeking a calm, low-key fish for tranquil community or species-focused systems.

Captive-bred individuals are noticeably harder than wild specimens and adapt more readily to aquarium life, making them an excellent option for aquarists looking for a unique yet manageable cardinalfish.

Key Features

• Scientific Name: Apogonichthyoides melas
• Common Names: Black Cardinalfish, Dusky Cardinalfish
• Adult Size: Up to 3 inches
• Lifespan: 3–5 years with proper care
• Temperament: Peaceful, very shy, and non-aggressive
• Reef Compatibility: Completely reef safe; will not harm corals or invertebrates
• Minimum Tank Size: 30 gallons minimum; 40+ gallons recommended for pairs
• Experience Level: Beginner to Intermediate; hardy but requires patience due to shy nature

Habitat & Tank Requirements

Tank Environment:
The Black Cardinal requires a well-structured aquarium with abundant hiding places. Live rock formations, caves, crevices, and deep overhangs are essential for helping this species feel secure. It strongly prefers shaded areas and dim lighting, spending most daylight hours tucked away and becoming more visible during dusk and feeding times.

This species thrives in calm, low-stress environments and does best in peaceful aquariums with minimal disturbance. Avoid tanks dominated by aggressive or overly active fish.

Water Parameters:

• Temperature: 72–78°F (22–26°C)
• Salinity: 1.020–1.025
• pH: 8.1–8.4
• Stable reef conditions are essential for long-term health

Equipment Recommendations:

• Standard reef-quality filtration
• Protein skimmer
• Low to moderate water circulation (avoid strong or direct flow)

Maintaining stable water quality and a quiet environment is key to success with this species.

Diet & Feeding

Black Cardinals are carnivorous and feed primarily on small meaty foods. Captive-bred specimens typically adapt well to aquarium diets and are far less finicky than wild-caught individuals.

Recommended Foods:

• Staple Foods: High-quality marine pellets and carnivore pellets
• Frozen Foods: Mysis shrimp, brine shrimp, cyclops, finely chopped seafood, krill
• Live Foods: Optional during initial acclimation, but usually not necessary for captive-bred fish

Feeding Frequency:

• Once or twice daily
• Evening or low-light feeding encourages natural behavior and better feeding response

Special Note:
This species is slow-moving and shy, so ensure food reaches it before faster tank mates consume everything.

Social Structure & Group Dynamics

• Best Kept: Singly or in established pairs
• Group Housing: Possible only in larger aquariums (40–50+ gallons) with extensive rockwork and hiding spaces
• Temperament: Completely peaceful; will not harass tank mates
• Tank Mates: Ideal with other small, calm, non-aggressive reef fish

Males are mouth-brooders, a characteristic behavior shared with other cardinalfish species.

Notes & Considerations

• Uniform dark coloration creates a bold, dramatic contrast in reef displays
• One of the more nocturnal cardinalfish species; often hidden during bright daylight hours
• Thrives best in dimly lit or shaded aquariums
• May remain hidden for extended periods if stressed
• Subtle bronze or faint iridescent sheen may appear under certain lighting conditions
• Slow-moving and easily outcompeted by aggressive feeders
• Excellent choice for peaceful community tanks or species-specific setups
• Not recommended for brightly lit display tanks without sufficient cover
• Requires a patient aquarist willing to accommodate shy, nocturnal behavior

Why Choose a Quarantined Black Cardinal?

Purchasing a quarantined, captive-bred Black Cardinal from us ensures you receive a healthy, well-acclimated specimen. All fish are carefully observed, treated when necessary, and conditioned to accept prepared foods prior to sale. Our quarantine process significantly improves long-term success, particularly for this shy species, allowing it to transition smoothly into its new environment and thrive for years to come.