McCosker's Flasher Wrasse - Paracheilinus mccoskeri
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The McCosker’s Flasher Wrasse (Paracheilinus mccoskeri) is a vibrant and energetic saltwater fish, featuring a red-orange body with a yellow belly, horizontal iridescent blue stripes, deep red anal and caudal fins accented with blue streaks, and a yellow dorsal fin with a blue streak and a single extended streamer. This peaceful wrasse adds dynamic movement and striking color to reef aquariums.
Common Name: McCosker’s Flasher Wrasse
Scientific Name: Paracheilinus mccoskeri
Family: Labridae
Size: Up to 3 inches (7.5 cm)
Temperament: Peaceful
Difficulty: Moderate
Reef Safe: Yes
Native Region: Found throughout the Indo-Pacific, including Indonesia and the Philippines, typically inhabiting reef slopes with abundant cover and sandy patches for burrowing at night.
Tank Size: Minimum of 30 gallons
Temperature: 75–82°F (24–28°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate/Decor: Provide a deep sand bed for sleeping and burrowing, plenty of live rock for hiding, and open swimming areas; moderate water flow is preferred.
• Behavior: Peaceful and active; often performs flashing displays during courtship or when excited.
• Diet: Carnivorous—feeds on small meaty foods such as mysis shrimp, brine shrimp, and high-quality prepared diets.
• Tankmates: Compatible with other peaceful fish; avoid aggressive species that may stress the wrasse.
• Placement: Ensure a secure lid as wrasses are known to jump from tanks.