FishMarineAdvanced
©AI Generated·Proprietary
Flame Anthias
Pseudanthias ignitus
A spectacular schooling reef fish famed for the male's intense fiery-red coloration and its complex, active haremic social structure.
Water Temperature
22 - 27 °C
pH Value
8.1 - 8.4
Water type
Marine
Tank level
Bottom and middle
Adult size
9 cm
Minimum tank volume
>= 250 L
Minimum group
>= 4
KH
8 - 12 dKH
Species description
Geographical Origin and Habitat: Pseudanthias ignitus, commonly known as the flame anthias, is a marine fish native to the tropical waters of the Indian Ocean, ranging from the Maldives to Sumatra and the Andaman Sea. It inhabits seaward reefs and drop-offs exposed to strong currents, at depths between 10 and 30 meters. It is typically found in large schools hovering above branching Acropora corals, which provide quick shelter from predators.
Taxonomy and Morphology: It belongs to the Serranidae family, Anthiadinae subfamily, and Pseudanthias genus. It features a slender, elongated, and laterally compressed body shape, reaching a maximum total length of 8 to 10 centimeters. It has large eyes suited for hunting zooplankton and a deeply forked caudal fin with lobes that can develop long filaments in mature males.
Social Behavior: This is a highly gregarious species with a complex hierarchical social structure. It is a protogynous hermaphrodite, living in harems composed of a single dominant male and several females. The male defends the harem and territory; if the male dies, the largest and most dominant female will change sex to male within a few weeks. Males exhibit territorial behavior toward conspecific rivals.
Coloration and Sexual Dimorphism: The coloration is striking and exhibits distinct sexual dimorphism. Females are primarily golden-yellow or orange, with a bright orange stripe running from the eye to the pectoral fin base. Mature males display an intense red-orange body, with a brilliant flame-red dorsal fin (giving the species its name) and a yellow tail bordered with red margins.
Care, breeding and tankmates
Aquarium Setup: Requires a mature, well-established reef aquarium of at least 300 liters (approx. 80 gallons) to house a small harem. It is essential to provide an extensive live rock structure with many caves, ledges, and overhangs for shelter, while maintaining ample open swimming space in the middle and upper water columns. High water movement generated by wavemakers is critical to simulate their native current-swept reefs.
Diet and Feeding: Feeding is the most demanding aspect of their husbandry. As active planktivores, they burn energy rapidly and must be fed three to four times daily with small portions. The diet should consist of high-quality frozen foods, such as mysis shrimp, finely chopped krill, brine shrimp, copepods, and liquid zooplankton. They can eventually be transitioned to high-quality dry pellets or flakes.
Water Quality: Demands exceptional water quality and stable reef parameters: water temperature between 24 and 27°C, pH between 8.1 and 8.4, and specific gravity of 1.023 to 1.025. Ammonia and nitrites must be kept at zero, and nitrates below 10 ppm. A high-efficiency protein skimmer, regular water changes, and active carbon filtration are mandatory to handle the high organic bioload from frequent feedings.
Compatibility and Cohabitation: Excellent candidate for reef aquariums with stony and soft corals. It coexists peacefully with other non-aggressive reef fish like tangs, clownfish, blennies, and gobies. Avoid keeping with highly aggressive or territorial species that might intimidate them, preventing them from feeding in the water column. Do not house more than one male per tank.
Aquarium Breeding: Breeding in home aquariums is extremely difficult, and successful rearing of fry is rarely reported due to the complex planktonic larval phase. In nature, spawning occurs at dusk in the open water column, where eggs and sperm are released into the current. Larvae require specialized, microscopic live foods in dedicated rearing systems.
Risks and Diseases: The primary risk is rapid weight loss and starvation due to shipping stress or insufficient feeding frequency. They are susceptible to marine ich (Cryptocaryon irritans) and marine velvet (Oodinium). A dedicated quarantine period is highly recommended, during which they can be acclimated to aquarium foods in a low-stress environment.
Geographic Origin and Distribution
Pseudanthias ignitus, commonly known as the flame anthias, is a marine fish native to the tropical waters of the Indian Ocean, ranging from the Maldives to Sumatra and the Andaman Sea. It inhabits seaward reefs and drop-offs exposed to strong currents, at depths between 10 and 30 meters. It is typically found in large schools hovering above branching Acropora corals, which provide quick shelter from predators.
Origin
Tropical oceans and reefsSouth and Southeast Asia
Fish profile
- Temperament
- Peaceful
- The temperament of Pseudanthias ignitus is generally peaceful towards completely unrelated fish, making them wonderful community residents. However, they establish a strict pecking order within their own group, which can involve some chasing and posturing. The dominant male will frequently display to the females to maintain his status and keep the harem in line. While usually harmless, this internal squabbling requires adequate space and hiding spots for subordinate individuals. They should not be housed with overly aggressive predators that might bully or consume them.
- Diet
- Carnivore
- In the wild, Pseudanthias ignitus is a dedicated zooplanktivore that constantly picks tiny organisms from the water column. In the home aquarium, they require a varied diet consisting of high-quality frozen or live meaty foods. Suitable options include mysis shrimp, enriched brine shrimp, copepods, and finely chopped seafood. Getting them to accept dry prepared foods like high-quality flakes or small pellets can take time and patience. A diverse nutritional profile is crucial for maintaining their vibrant coloration and immune health.
- Life expectancy
- 5-7 years
- The Flame Anthias typically has a lifespan of 5 to 7 years in captivity under proper, diligent care. To support their long-term health, they require stable water parameters, a stress-free environment, and high-quality nutrition. Ensuring a peaceful tank dynamic and keeping them in a harem group will help minimize stress, which is vital for their longevity. Excellent filtration and regular water maintenance are also essential to support their high feeding frequency.
- Adult size
- 9 cm
- The catalog's scalar value is 9 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 9 cm for this species, recorded as total length (TL). The taxonomic record consulted is Pseudanthias ignitus (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Harem
- This species exhibits a fascinating social structure characterized by protogynous hermaphroditism, where all individuals are born female. A typical group consists of a single dominant male maintaining a harem of several females. If the dominant male is removed or dies, the largest and most dominant female will morph into a male to take his place. For the home aquarium, it is best to purchase a group of females and allow this natural transition to occur. Keeping multiple males usually results in fatal aggression unless the tank is massive.
- Feeding frequency
- Twice daily
- Due to their incredibly active metabolism and natural grazing behavior, Pseudanthias ignitus requires multiple feedings throughout the day. It is highly recommended to feed them small amounts at least three to four times daily. Infrequent, large feedings are poorly digested and can lead to malnutrition or starvation over time. Automated feeders can be very useful for dispensing small amounts of dry food while the aquarist is away. Consistent, frequent meals are the key to long-term success with this species.
- Bioload
- Pseudanthias ignitus contributes a moderate amount to the overall bioload of a marine aquarium system. Due to their highly active nature and constant swimming, they require frequent feedings which indirectly increases the organic waste produced. Excellent filtration and regular water changes are strongly recommended to process these nutrients. Maintaining a robust protein skimmer will help manage the dissolved organics effectively. Proper husbandry ensures that the bioload remains manageable over the long term.
- Flow
- Strong
- This species originates from dynamic reef environments where strong water movement is a constant factor. Pseudanthias ignitus thrives in aquariums that provide moderate to strong, turbulent water flow across the aquascape. Brisk currents simulate their natural habitat and encourage their natural schooling and feeding behaviors in the water column. Powerheads or wavemakers should be positioned to create broad, sweeping flow patterns rather than harsh, direct streams. Adequate flow also keeps particulate food suspended longer, giving them more time to feed.
- Jump risk
- Yes
- Like many highly active reef fishes, Pseudanthias ignitus presents a moderate to high risk of jumping out of an open aquarium. They are easily startled by sudden movements, lighting changes, or aggressive tank mates, which can trigger a flight response. It is strongly advised to keep a tight-fitting lid or a custom mesh screen over the tank at all times. Even small gaps around equipment and overflow boxes should be covered to prevent tragic accidents. Taking these precautions is a simple but vital part of their husbandry.
- Reproduction
- Oviparous
- Breeding Pseudanthias ignitus in a home aquarium is exceptionally rare and presents significant challenges for even advanced hobbyists. They are pelagic spawners that release their eggs and sperm into the water column during synchronized mating rituals. The resulting larvae are microscopic and require highly specialized, perfectly sized live planktonic foods to survive. Furthermore, the larval stage is extremely long and sensitive to minute changes in water quality. Consequently, nearly all specimens available in the trade are wild-caught rather than captive-bred.
- Compatibility & tankmates
- Reef safe
- This species is generally considered completely reef safe and makes a stunning addition to mixed reef aquariums. Pseudanthias ignitus will typically ignore corals, sessile invertebrates, and most motile invertebrates like ornamental shrimp. They are generally peaceful towards heterospecifics but can display significant aggression towards other Anthias species. It is usually best to keep them as the only Anthias species in the tank unless the aquarium is exceptionally large. Careful observation is needed when introducing new tank mates to ensure harmony.
- Tank level
- Middle/Bottom
- Throughout the day, Pseudanthias ignitus will predominantly occupy the middle to upper levels of the water column. They are highly visible fish that love to hover above the reef structure, facing into the current to catch passing food. At night or when frightened, they will quickly dart into the rockwork to seek shelter in crevices and caves. Providing plenty of open swimming space alongside complex rock formations is essential for their comfort. Their active presence brings a wonderful sense of movement and life to the upper reef zones.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.1 ± 0.3 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01413, b = 3
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
