More info
Datasheet
| Minimum Tank Size | 200 litres / 52.83 US gallons |
| Maximum Size | 8.0cm / 3.15inches |
| Reef Compatible | Always reef safe |
| Temperament | Docile but might be aggressive towards similar species |
| Temperature | 22.2°C / 71.96°F - 25.6°C / 78.08°F |
| Specific Gravity | 1.020-1.025 |
| Carbonate Hardness | 8-12 |
| pH | 8.1-8.4 |
General Description
The McCosker's flasher (Paracheilinus mccoskeri) is a species of flasher wrasse known for its vibrant colors and active nature. These fish are peaceful but shy, making them best suited for aquariums without aggressive tank mates. Male flasher wrasses are particularly striking, often displaying longer filaments on their dorsal fins compared to females. In captivity, maintaining their vibrant colors can be challenging, requiring a diverse and high-quality diet.
Aquarium Suitability
Considered suitable for aquariums, McCosker's flasher requires careful consideration when selecting tank mates due to its docile nature. It is recommended to keep them in pairs or with one male and multiple females to prevent aggression. These fish are sensitive during transportation and acclimatization, so proper care is essential to ensure their well-being.
Care and Hardiness
With an average hardiness level, McCosker's flasher thrives in tank environments with hiding spots, such as live rocks. They prefer a varied diet consisting of small crustaceans and zooplankton. Regular feeding is essential, especially during the initial acclimatization period. Additionally, these wrasses can change gender from female to male, adapting to the needs of the group.
Reef Suitability
Known for being reef-safe, McCosker's flasher is a popular choice for reef aquariums. They contribute positively to the ecosystem by preying on unwanted invertebrates like flatworms and pyramide snails. Their compatibility with reef environments makes them a valuable addition to marine tanks.
Aquarium Setup
For optimal care, provide a tank size of at least 200 liters with suitable hiding spots and live rocks for security. Maintaining stable water conditions with a pH range of 8.1-8.4, a temperature between 22.2-25.6°C, and a specific gravity of 1.020-1.025 is crucial for their well-being. Keep the carbonate hardness (KH) levels between 8-12 for a healthy aquatic environment.
Behaviour
McCosker's flasher wrasses exhibit docile behavior but can display aggression towards similar species. They may initially hide when introduced to a new environment, requiring a period of acclimatization before becoming more active. These fish showcase their vibrant colors, especially in the presence of females, where males display elaborate courtship rituals.
Feeding and Diet
A varied diet including small crustaceans like krill and mysis, as well as zooplankton such as cyclops and pods, is essential for the nutritional needs of McCosker's flasher. Regular feeding several times a day is recommended, particularly during the acclimatization phase when they may be more reluctant to eat.
Habitat and Distribution
Native to the Indo-West Pacific region from the western Indian Ocean to Fiji, McCosker's flasher thrives in tropical marine environments. They are commonly found in areas with ample hiding spots among rocks and coral reefs. Their distribution includes regions such as the East and West Indian Ocean, Australia, the Red Sea, Indonesia, and the Central/West Pacific.