McCoskers cf Africa Flasher Wrasse (Paracheilinus Cf Mccoskeri) saltwater aquarium fish portrait

McCosker's Flasher Wrasse, Paracheilinus mccoskeri, is a compact member of the wrasse family that reaches roughly 3.3 inches. Males carry red to orange bodies crossed by electric-blue horizontal striping, yellow bellies, and orange dorsal and anal fins accented in red, yellow, and blue, finished with several elongated dorsal filaments. Females are considerably more subdued and lack the extended finnage. The species occurs in the western Indian Ocean and adjacent Indo-Pacific waters, including the Maldives, Sri Lanka, and the Andaman Sea, where it hovers over rubble zones and outer reef slopes at depths of about 30 to 130 feet and picks zooplankton from the water column. In the trade it is often confused with Carpenter's Flasher Wrasse, which shows a single long dorsal filament and cleaner banding rather than the multiple filaments seen here.

Adults should be housed in an aquarium of at least 75 gallons, which also gives a male and a group of females enough personal space to settle. Build rockwork with rubble and crevices for nighttime shelter, but keep generous open swimming lanes, since this wrasse patrols the water column through the day rather than hugging structure. A tight-fitting or fully sealed mesh lid is mandatory; this fish is an exceptional and accurate jumper and will find even a small gap, particularly when startled after dark. A stable mixed reef system suits it well, and while it is not unusually parameter-sensitive, minimizing swings in temperature and salinity matters because rapid changes suppress immunity and can trigger shipping-related infections. Care level is moderate, largely because of the escape risk and the need for frequent feeding.

On the reef this carnivore feeds on copepods and other zooplankton taken from open water above rubble slopes, so captive husbandry centers on small, meaty, suspended items. Offer a varied rotation of vitamin-enriched frozen mysis shrimp, frozen brine shrimp, and similar meaty preparations, supported by finely sized marine flake and pellet foods. Oyster eggs and live or frozen copepods round out the nutrition and closely match its natural prey.

Metabolism is high and the stomach is small, so several smaller feedings per day produce the best condition and color, especially during the first weeks in a new system. Once the fish is established and grazing on natural plankton and microfauna within mature rockwork, feeding frequency can be scaled back. Freshly acquired specimens may take a day or two before they begin eating, but they are rarely fussy once conditioned to prepared foods.

Frozen Mysis Shrimp Frozen Brine Shrimp Copepods Oyster Eggs Marine Flake Food Marine Pellets Meaty Frozen Preparations
This is a peaceful, somewhat shy wrasse that is at its best in a male-female pair or a harem of one male with several females. Only one male should be kept in systems under roughly 125 gallons, since rival males display competitively; experienced keepers have managed multiple males only in very large aquariums. Males intensify dramatically and perform a rapid flashing display, flaring every fin and darting back and forth, to court females or confront rivals and even their own reflection. Adding more females increases how often that display occurs. Between bouts the same male can look pale and washed out, which is normal rather than a sign of trouble.

Because of its docile nature, it should not share a tank with aggressive dottybacks, large wrasses, or other assertive fish that will bully it away from food and open water. It mixes well with other mild-mannered reef fish and is a favorite in mixed reef displays. The species is reef safe and is not known to damage corals or other sessile invertebrates. Wrasses in this genus do pick at small motile invertebrates and can help control pests such as flatworms and pyramid snails, which means very small beneficial snails may also be sampled.

FAQ

Frequently Asked Questions

About the McCoskers cf Africa Flasher Wrasse

  • Do I need a lid on my aquarium for this fish?
    Yes. A tight-fitting or fully sealed mesh lid is essential, because this wrasse is a strong and accurate jumper that can escape through small gaps, especially when startled at night.
  • Can I keep more than one male together?
    Keep only one male per aquarium unless the system is very large, around 125 gallons or more. A single male with one or several females is the most reliable arrangement.
  • Why does the male sometimes look pale?
    Males only show full color during flashing displays, when they flare their fins and dart about. Between those bouts a muted appearance is normal rather than a stress signal.