McCosker's Flasher Wrasse (Paracheilinus mccoskeri)

Paracheilinus mccoskeri , commonly known as McCosker's flasher wrasse , is a spectacular small reef wrasse belonging to the Labridae family.

Highly valued in marine aquariums for:

• Its intense red-orange colors

• Its electric blue lines

• Its elongated dorsal fins

• Its luminous courtship displays ("flashing")

Native to the Indo-Pacific (East Africa, Maldives, Sri Lanka), it lives above coral reefs, often in small groups.

The male develops brighter colours and performs impressive displays, particularly in the presence of females or other males.

Minimum volume: 55 gallons (US)
Temperature: 75–79 °F
Specific Gravity: 1.023–1.025
pH: 8.0–8.4
Decor: Live rock with multiple hiding places

Behavior in a reef aquarium

✔ Peaceful fish
✔ Very active in open water
✔ Reef compatible (reef safe)
✔ Can live in a harem (1 male + several females)

⚠ Jumping species: aquarium must be covered.

Planktivorous carnivore:

• Artemia

• Mysis

• Fine krill

• Variety of frozen food

• high-quality marine pellets

Smaller, more frequent meals are recommended (2 to 3 times a day).

Compatibility

✔ Compatible with corals
✔ Compatible with invertebrates
✔ Can coexist with other calm wrasses
⚠ Avoid with aggressive or territorial species

If males are to be kept together, a large space is required.

Points to consider

• Aquarium closed (for large jumpers)

• Sensitive to stress during acclimatization

• Bring fine sand for overnight rest

• Can change sex (protogynous hermaphrodite)