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Eightline flasher wrasse

Paracheilinus octotaenia

The Eight-lined Flasher Wrasse is a stunning Red Sea endemic. Showcasing eight neon blue stripes and brilliant displays, it requires substantial open space in mature reef systems.

Taxonomy
Class:Actinopteri
Order:Perciformes
Family:Labridae
Subfamily:Cirrhilabrinae
Genus:Paracheilinus
Species:Paracheilinus octotaenia

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Water Temperature

22 - 27 °C

pH Value

8.1 - 8.4

Water type

Marine

Tank level

Bottom and middle

Adult size

10 cm

Minimum tank volume

>= 150 L

Minimum group

>= 1

KH

8 - 12 dKH

Species description

Geographical Origin and Habitat: Paracheilinus octotaenia is endemic to the Red Sea, where it is found in sheltered lagoons, seaward reefs, and coral-rich outer slopes. It typically occurs at depths between 5 and 40 meters. It prefers areas with moderate current and a high density of soft and stony corals, where it swims in loose aggregations consisting of a dominant male and multiple females.
Taxonomy and Morphology: Belongs to the family Labridae and the genus Paracheilinus. It is a small wrasse species, reaching a maximum total length of 8 to 9 cm. It features a streamlined body with large eyes suited for picking zooplankton. Adult males develop elongated, filamentous rays on their dorsal and anal fins, as well as a lanceolate tail fin.
Social Behavior: Peaceful, active, and highly social. Males perform elaborate flashing displays to court females or establish dominance over rival males, during which their colors intensify dramatically to a bright metallic glow. It is non-aggressive toward other species but can be intimidated by boisterous tankmates.
Coloration and Sexual Dimorphism: The body features a vibrant orange-red background color decorated with eight horizontal, iridescent blue-violet stripes. Sexual dimorphism is highly pronounced: males are larger, possess much brighter colors, and have long fin filaments, whereas females are smaller, have a duller coloration, and lack filamentous fins.

Care, breeding and tankmates

Aquarium Setup: Needs a reef aquarium of at least 150 liters with plenty of open swimming space in the middle of the water column. Provide ample live rock arranged with caves and overhangs for nighttime shelter. A tight-fitting lid or mesh screen cover is mandatory, as this fish is a notorious jumper when startled.
Diet and Feeding: A planktivore that needs to be fed small portions 2 to 3 times daily. Provide a varied diet of frozen foods such as mysis, brine shrimp, copepods, and fish eggs, alongside high-quality marine flakes and micro-pellets. Feeding high-carotene foods helps preserve their intense colors.
Water Quality: Requires stable marine water conditions: temperature of 23 °C to 27 °C, pH of 8.1 to 8.4, specific gravity of 1.020 to 1.025. Strong water movement and high dissolved oxygen levels are beneficial. Perform regular water changes to keep nitrate levels below 15 ppm.
Compatibility and Cohabitation: Excellent reef-safe community fish. It is best housed in a harem setting with one male and two or more females (females should be introduced first). Compatible with peaceful fish like gobies, firefish, and small cardinals. Avoid aggressive tankmates like dottybacks or large damselfish.
Aquarium Breeding: Breeding in captivity is rarely documented. Spawning occurs in mid-water at dusk, releasing pelagic eggs. The tiny, fragile larvae require specialized live micro-foods and are very difficult to raise successfully under aquarium conditions.
Risks and Diseases: Prone to physical injury or death from jumping out of uncovered aquariums. They can also suffer from shipping stress and external parasites such as Ich. Like other wrasses, they secrete a protective mucus cocoon at night to sleep in, which should not be mistaken for illness.

Geographic Origin and Distribution

Paracheilinus octotaenia is endemic to the Red Sea, where it is found in sheltered lagoons, seaward reefs, and coral-rich outer slopes. It typically occurs at depths between 5 and 40 meters. It prefers areas with moderate current and a high density of soft and stony corals, where it swims in loose aggregations consisting of a dominant male and multiple females.

Origin

Tropical oceans and reefsSouth and Southeast Asia

Fish profile

Temperament
Peaceful
They have an incredibly peaceful and shy disposition. Males flash their fins but rarely harm tank mates. They are easily bullied by more boisterous tank species.
Diet
Carnivore
They are planktivores that feed on zooplankton. In captivity, they readily accept frozen mysis and brine shrimp. High-quality marine flakes can also be offered daily.
Sex ratio
Harem
Keep a single male with multiple females for natural behavior. Multiple males will fight unless the tank is massive. One male to three females is the ideal ratio.
Feeding frequency
Twice daily
They have a fast metabolism and need frequent feeding. Offer small meals two to three times per day. Consistent feeding maintains their vibrant colors and health.
Bioload
This species produces a low biological load. Their small size means they generate minimal waste. Standard protein skimming and regular water changes are adequate.
Flow
Moderate
They prefer moderate to strong water movement. Good flow keeps their zooplankton food suspended for foraging. Ensure there are lower flow areas for resting at night.
Jump risk
Yes
They have a notorious reputation for jumping. A tight-fitting lid or mesh screen is absolutely mandatory. Even tiny gaps can provide enough space to escape.
Reproduction
Oviparous
They are protogynous hermaphrodites, with females becoming males. The dominant fish typically becomes a brightly colored male. Captive breeding is rare but courtship is common.
Compatibility & tankmates
Peaceful
They are highly peaceful reef community fish. Avoid housing them with aggressive or large predatory species. They mix well with other peaceful wrasses in large tanks.
Tank level
Middle/Bottom
These wrasses swim in the middle to upper levels. They actively cruise open water looking for suspended food. At night, they seek shelter in bottom rock crevices.

Window to the official scientific data of the species

Data synced on: 06/15/2026

Scientific Parameters & Models

Trophic level
3.4 ± 0.45 se
Resilience
High (less than 15 months)
Phylogenetic uniqueness (PD50)
0.5
Bayesian Length-Weight
a = 0.01072, b = 3.03
VulnerabilityLow vulnerability (10 / 100)

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

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Last updated: 06/30/2026