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Banggai Cardinalfish
Pterapogon kauderni
Animalia›Chordata›Actinopterygii›Apogonidae
📍 Banggai Archipelago, Indonesia
Elegant black-and-silver with distinctive elongated fins and bold stripes. A mouthbrooder — the male incubates eggs in his mouth until hatching. One of the few marine fish regularly bred in home aquaria.
Care Guide
Diet
Banggai Cardinalfish are carnivorous and require a varied diet of small frozen foods. Feed mysis shrimp, brine shrimp, and copepods once daily in small portions. They may eventually accept high-quality carnivore pellets, but live or frozen foods should remain the dietary staple.
Behavior
These peaceful, mid-water swimmers are best kept in small groups of 3 or more to reduce aggression and stress. They are relatively inactive and prefer dimly lit tanks with plenty of hiding spots among rocks and plants. Males are mouthbrooders and will exhibit territorial behavior during breeding, but remain non-aggressive toward other species.
Breeding
Banggai Cardinalfish are one of the few marine species regularly bred in home aquaria, making them excellent for experienced hobbyists interested in breeding. Breeding requires stable conditions, a bonded pair, and patience—males incubate eggs in their mouth for 7-9 days before fry are released. Fry are relatively large and can accept newly hatched brine shrimp immediately.
Tank Mates
Similar peaceful temperament and compatible water parameters; both thrive in reef-safe environments
Peaceful reef fish with identical salinity and temperature requirements
Closely related species with similar care needs; may compete for food but generally compatible
Beneficial symbiotic relationship; shrimp will not harm cardinalfish and help maintain tank health
Can coexist but may be aggressive; ensure adequate space and hiding spots for both species
Common Diseases
Ich (Marine Ich)
White spots on body and fins, rapid breathing, rubbing against surfaces
Increase water temperature to 28-29°C, perform daily 25% water changes, use copper-based medication or UV sterilization if available
Bacterial Infection
Torn fins, cloudy eyes, lethargy, loss of appetite
Maintain excellent water quality with frequent partial water changes, use antibiotic medications if severe, isolate affected fish if possible
Velvet Disease
Fine golden or rust-colored dust on body, rapid breathing, scratching behavior
Increase temperature gradually to 28-29°C, reduce lighting, perform daily water changes, use copper treatment or formalin if necessary
Mouth Rot
Discolored or eroded mouth tissue, difficulty feeding, visible lesions around mouth
Improve water quality immediately, perform frequent water changes, use antibiotic medication, ensure proper nutrition with quality foods
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Quick Facts
- pH
- 8.1–8.4
- diet
- carnivore — mysis, brine shrimp, copepods
- maxSize
- 3 inches
- minTankSize
- 20 gallons
- temperature
- 73–82°F (23–28°C)
Temperature
73–82°F
23–28°C