Species Description…

Scientific Name: Apogon sealei

Common Name: Seale’s Cardinalfish

Species Group: Cardinalfish

Habitat: Reef Safe

Care Level: Beginner

Temperament: Peaceful

Diet Type: Carnivore

Role in Aquarium: Schooling Fish

Max Fish Length: 3 (inches)

Min Aquarium Size: 30 (gallons)

Native Range: Indo-Pacific, including Indonesia, the Philippines, and the Great Barrier Reef

Apogon Sealei - The Seale’s Cardinalfish

Apogon Sealei (The Seale’s Cardinalfish)

Native to the Indo-Pacific, commonly found in coral reefs, lagoons, and seagrass beds.
Distinguished by its slender body, reddish hue, and faint vertical bands along the flanks.
A nocturnal species that remains hidden among coral branches or caves during daylight hours.
Often observed in small groups or pairs, displaying schooling behavior for added security.
A desirable addition to marine aquariums due to its peaceful nature and ability to adapt to captivity.

Carnivorous diet, primarily consuming planktonic organisms, small crustaceans, and zooplankton.
Readily accepts frozen and live foods such as brine shrimp, mysis shrimp, and copepods.
Can adapt to eating high-quality marine flakes and pellets when introduced properly.
Requires multiple small meals daily to sustain energy levels and maintain health.
Offering a varied diet helps enhance their vibrant coloration and immune system.

Commonly found in reef environments with dense coral growth and rocky crevices.
Prefers moderate water movement and stable water conditions.
Aquariums should include ample live rock, shaded areas, and overhangs to mimic their natural habitat.
Thrives in reef tanks that provide both open swimming areas and safe hiding spots.
Providing natural cover reduces stress and promotes natural schooling behavior.

Ideal water temperature: 74-80°F (23-27°C) for optimal health.
Maintains best condition in a pH range of 8.1-8.4, with salinity levels between 1.020-1.025.
Requires high water quality with effective filtration to prevent ammonia and nitrate buildup.
Routine water changes and monitoring help sustain a stable and stress-free environment.
Providing a low-aggression tank setting enhances longevity and overall well-being.

A great choice for community reef aquariums due to its peaceful temperament.
Compatible with other non-aggressive species, including gobies, wrasses, tangs, and blennies.
Best kept in small groups to encourage schooling behavior and minimize stress.
Should not be housed with aggressive fish or large predators that may view them as prey.
Coexists well with reef-safe invertebrates such as shrimp and small crabs.

Tends to remain hidden during the day, emerging at dusk and night to forage.
Prefers swimming in small schools, displaying synchronized movement.
Can become more active and confident when housed with other peaceful species.
Providing rock formations and shaded areas supports their natural behavior and sense of security.
Thrives in dim lighting, making them an attractive choice for aquariums with evening or moonlight viewing.