Is the Banggai Cardinalfish reef safe?

Yes. It does not bother corals or most invertebrates and is a popular choice for reef tanks. Its slow, hovering swimming style means it should be kept with calm to moderately active tank mates rather than fast, aggressive competitors that could outcompete it for food or bully it.

Are Banggai Cardinalfish prone to disease?

Like most marine fish, they can be affected by common parasites such as marine ich or velvet, particularly after the stress of shipping or inadequate quarantine. A proper quarantine period before introduction to a display tank is recommended. Any medication should be dosed exactly according to the manufacturer's instructions for that specific product, and a fish-health professional should be consulted for treatment decisions rather than relying on generic dosing figures.

How do Banggai Cardinalfish breed?

They are paternal mouthbrooders with no larval planktonic stage, which makes them relatively straightforward to breed compared to most marine fish. After courtship and spawning, the male carries the fertilized eggs in his mouth for roughly three to four weeks until he releases fully formed juveniles capable of eating baby brine shrimp right away. The male typically eats little or nothing while brooding, so his condition should be monitored during this period.

Is the Banggai Cardinalfish endangered?

Yes. It is classified as Endangered on the IUCN Red List. The species is endemic to a very small range in Indonesia's Banggai Archipelago and has been heavily impacted by collection for the aquarium trade and habitat degradation. Choosing captive-bred Banggai cardinalfish, which are now widely available, helps reduce pressure on the remaining wild population.

Banggai Cardinalfish (Pterapogon kauderni)

Saltwaterpeacefulbeginner Care

Quick Answer

The Banggai Cardinalfish (Pterapogon kauderni) is a striking black-and-white fish from Indonesia, classified as Endangered on the IUCN Red List. It requires a minimum 30-gallon aquarium with a pH of 8.1–8.4 and a temperature range of about 22–27°C (72–80°F). As a peaceful carnivore that occupies the middle water column, it makes an excellent, beginner-friendly addition to community reef setups, especially when sourced as captive-bred stock.

Max Size 3 in (7.6 cm)

Difficulty beginner

Diet Carnivore

Quick Facts

Scientific Name	Pterapogon kauderni
Common Names	Banggai Cardinalfish
Type	Saltwater
Temperament	peaceful
Care Difficulty	beginner
Maximum Size	Up to 3 in (8 cm)
Diet	Carnivore
Temperature	75–79°F (24–26°C)
pH	8.1–8.4
Hardness	8–12 dGH
Minimum Size	30 gallons

Key Takeaways

Peaceful toward other species; may spar with its own kind, especially between same-sex individuals.
Reaches about 3 inches (7.6 cm) and needs at least a 30-gallon aquarium.
Readily eats frozen and prepared foods, unlike many marine fish.
Classified Endangered by the IUCN; choose captive-bred individuals when possible.

Essential Requirements

Beginner Aquarium Setup

Learn how to build the perfect first tank.

Water Chemistry

Keep parameters stable and safe.

Nitrogen Cycle

Understanding the aquarium cycle.

Compatible Tank Mates

African Butterflyfish

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African Cichlid

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African Leaf Fish

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African Red Eyed Tetra

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Angelfish

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Apistogramma

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African Butterflyfish

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African Cichlid

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African Leaf Fish

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African Red Eyed Tetra

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Angelfish

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Apistogramma

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Species Comparison

Species	Adult Size	Temperament	Min. Tank Size	Difficulty
Banggai Cardinalfish (Pterapogon kauderni)	3 in (7.6 cm)	Peaceful	30 gal (114 L)	Beginner
Pajama Cardinalfish (Sphaeramia nematoptera)	3 in (7.6 cm)	Peaceful	30 gal (114 L)	Beginner
Longspine Cardinalfish (Zoramia leptacantha)	2 in (5 cm)	Peaceful	30 gal (114 L)	Beginner
Threadfin Cardinalfish (Zoramia perlita)	1.5 in (4 cm)	Peaceful	20 gal (75 L)	Beginner

Frequently Asked Questions

How many Banggai Cardinalfish can be kept together?

Keep a single individual or a confirmed male-female pair in a tank of at least 30 gallons (114 liters). Banggai cardinalfish (Pterapogon kauderni) are peaceful toward other species but can become territorial with their own kind, especially between mature individuals of the same sex, leading to fin nipping and chasing. Small groups can sometimes work in much larger systems (75+ gallons) with extensive rockwork and hiding places, but a bonded pair is the most reliable arrangement for most home tanks.

What water parameters does a Banggai Cardinalfish need?

Aim for a stable reef environment: temperature around 72–80°F (22–27°C), pH 8.1–8.4, specific gravity roughly 1.023–1.025, and low, stable nitrates maintained through regular partial water changes. Like most marine fish they are more sensitive to fluctuating parameters than to any single exact number, so consistency matters more than hitting a precise target.

What is the minimum tank size for a Banggai Cardinalfish?

A single fish or bonded pair does well in 30 gallons (114 liters) or larger; some keepers successfully house a pair in slightly smaller nano tanks with excellent water stability, but 30 gallons gives more of a safety margin. Keeping a small group requires considerably more space (75+ gallons) with ample hiding places to diffuse territorial disputes.

What do Banggai Cardinalfish eat?

They are carnivorous zooplanktivores that feed on copepods and other small crustaceans in the wild. In the aquarium, they readily accept frozen mysis shrimp, enriched brine shrimp, chopped krill, and quality marine pellets, making them one of the easier marine fish to feed. Offer a varied diet two to three times daily; unlike some marine species, they generally do not require live food to thrive.