Pretty-Fin Cardinalfish

The Iridescent Cardinalfish (Pristiapogon kallopterus) is a larger and more robust species of cardinalfish than many of its relatives, reaching up to six inches in length. Its body displays a subtle but attractive iridescent blue-green sheen over a silvery base, with a distinctive dark bar running through the eye and a prominent dark spot at the base of the caudal peduncle. The combination of its shimmering coloration and larger size makes it an impressive representative of the cardinalfish family.

In the wild, this species is widely distributed across the Indo-Pacific, from the Red Sea and East African coast to the Great Barrier Reef and central Pacific islands. Unlike many cardinalfish that form tight schools, Pristiapogon kallopterus is often found singly or in small loose aggregations around coral heads, rocky outcrops, and pier pilings. It is a nocturnal species that shelters in caves and crevices during the day and emerges at dusk to hunt small crustaceans and zooplankton in the water column.

In the home aquarium, the Iridescent Cardinalfish is hardy and easy to care for, making it suitable for beginner marine aquarists. Its larger size compared to most cardinalfish means it can hold its own in community tanks with a wider range of tankmates. A tank of at least 30 gallons provides adequate space for this species. It is completely reef-safe and poses no threat to corals or invertebrates. Providing caves or overhangs for daytime shelter helps the fish feel secure and encourages natural behavior.