🐟 McCosker's Flasher Wrasse (Paracheilinus mccoskeri)
Reef-Safe Wrasse • Display Fish • Active Flasher Species
 
📋 The McCosker's Flasher Wrasse (Paracheilinus mccoskeri) is one of the most sought-after wrasses for reef aquariums. Known for its vivid orange-red body with electric blue lines and elongated filamented dorsal fin, it is a stunning display fish.
Males are especially spectacular, performing “flashing” displays where they intensify their colors and extend their fins to impress females or establish dominance. These behaviors are best observed when keeping them in harems with multiple females.
A peaceful and reef-safe species, McCosker’s Flasher Wrasses are ideal for mixed reef setups. However, they are jumpers and require a secure lid. With proper care, they thrive in aquariums with strong water movement and plenty of open swimming space.
 
💡 Highlights
✨ Brilliant red and blue coloration – stunning display fish
⚪ Flashing courtship displays – unique fin-spreading behavior
📏 Small size – ideal for nano to mid-size reefs
✅ Reef safe – peaceful, won’t harm corals or inverts
🐠 Active swimmer – adds constant movement to aquariums