The Diamond Tail Flasher Wrasse (Paracheilinus attenuatus) is a vibrant and active marine fish, highly sought after by aquarium enthusiasts for its striking appearance and peaceful temperament. Native to the Indian Ocean, particularly around Kenya, this species thrives in coral-rich environments.
Key Information
• Small fish safe: ✅ Yes (peaceful and non-aggressive)
• Small invertebrate safe: ✅ Yes (reef-safe; does not harm invertebrates)
• Coral safe: ✅ Yes (does not harm corals)
• Minimum tank size: 208 litres (55 gallons)
• Adult size: Up to 7.6 cm (3 inches)
• Diet: Carnivorous, primarily feeding on zooplankton and small meaty foods
• Be aware of: Prone to jumping (requires a secure lid); males exhibit enhanced coloration during courtship displays; best maintained singly or in harems with one male and multiple females
Appearance and Colouration
The Diamond Tail Flasher Wrasse exhibits sexual dimorphism:
• Males: Showcase vibrant red or orange bodies with horizontal blue stripes and a yellow abdomen. The dorsal fin is multi-coloured with red, yellow, and blue hues, featuring a single elongated ray. The caudal fin is diamond-shaped, giving the species its common name.
• Females and Juveniles: Present more subdued colouration with smaller fins.
Natural Habitat and Behaviour
Paracheilinus attenuatus inhabits coral reefs and rubble zones, typically at depths where they can form small groups. In these groups, a dominant male swims among several females and juveniles. They are diurnal and active swimmers, spending most of their time mid-water, foraging for planktonic prey.
Tank Requirements and Water Parameters
• Minimum Tank Size: 208 litres (55 gallons)
• Water Parameters:
• Temperature: 22°C – 26°C (72°F – 78°F)
• pH: 8.1 – 8.4
• Specific Gravity: 1.020 – 1.025
• Aquascaping:
• Incorporate ample live rock formations to create hiding spots and replicate their natural reef environment.
• Ensure open swimming spaces to accommodate their active nature.
• Lighting: Moderate to high, simulating natural reef conditions.
• Water Movement: Moderate to strong, reflecting their native habitat.
Important Note: A secure, tight-fitting lid is essential, as Diamond Tail Flasher Wrasses are known jumpers, especially when startled.
Diet and Feeding
In their natural environment, these wrasses primarily feed on zooplankton. In captivity, they adapt well to a variety of meaty foods.
• Captive Diet:
• Offer vitamin-enriched frozen mysis shrimp and brine shrimp.
• Provide high-quality marine flake and pellet foods.
• Supplement with live foods such as copepods and amphipods to encourage natural foraging behaviours.
Feeding Frequency: Feed small amounts 2-3 times daily to maintain health and vibrant colouration.
Compatibility and Social Structure
• Temperament: Generally peaceful and suitable for community aquariums. Males may display increased colouration and fin displays during courtship.
• Tank Mates: Compatible with other non-aggressive species such as gobies, blennies, and dwarf angelfish. Avoid housing with aggressive or significantly larger species that may intimidate or outcompete them.
• Social Structure: Best kept singly or in harems with one male and multiple females. Introducing multiple males in the same tank can lead to aggression unless the aquarium is sufficiently large.
Important Considerations
• Jumping Behaviour: Ensure the aquarium has a secure lid, as these wrasses are prone to leaping out of tanks.
• Acclimation: Introduce them to well-established aquariums with stable water parameters to reduce stress.
• Colour Variability: Depending on their geographic origin, colouration may vary among individuals.
Summary
The Diamond Tail Flasher Wrasse (Paracheilinus attenuatus) is a vibrant and active addition to marine aquariums. Their peaceful nature, striking colouration, and dynamic swimming behaviour make them a favourite among reef keepers. Providing appropriate tank conditions, a suitable diet, and a compatible social environment ensures that this beautiful species will thrive in captivity.