
Source: Wikimedia Commons
Pseudanthias pleurotaenia
A large anthias whose males show a pale square blotch on the flank. Females are yellow, males pink to magenta; shoals gather on current-swept drop-offs. Colours fade under strong light, so it suits dimmer tanks.
The squareback or squarespot anthias (Pseudanthias pleurotaenia) ranges from Indonesia to Samoa, north to the Ryukyu Islands and south to New Caledonia and the Rowley Shoals in the eastern Indian Ocean. Recorded to 180 m but usually shallower than 25 m, it forms shoals a few metres above the edges of current-swept drop-offs. Males are pink to magenta with a pale square blotch on the flank; females are yellow with a lavender belly and a thin blue line from the eye to the pectoral fin. Juveniles are solitary and stay close to shelter. At up to about 20 cm it is a large anthias. It is a protogynous hermaphrodite: when the male disappears, the largest female changes sex. Care is of moderate difficulty; colours fade under strong light, so dim, indirect lighting suits it. Feed frozen mysis, enriched brine shrimp and similar foods in small amounts several times a day. A single fish can be kept in a mid-sized tank, but a group needs a large tank with plenty of swimming room.
Source: Wikipedia (CC BY-SA 4.0)
The Squareback Anthias grows to Up to 20 cm.
The ideal temperature for the Squareback Anthias is 22〜26℃.
Origin
Western Pacific (Indonesia to Samoa, north to the Ryukyu Islands, south to New Caledonia)
Size
Up to 20 cm
Temperature
22〜26℃
Sources: LiveAquaria / FishBase
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Sources: CITES Appendices (species not listed) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
Frozen mysis, enriched brine shrimp, copepods, pellets
Colours fade under strong light; use dim, indirect lighting and provide overhangs to rest under. Like other anthias it wastes quickly if underfed.
Large (up to 20 cm). About 380 L for a single fish, 680 L or more for a group, with ample swimming space.
22-26C, pH 8.1-8.4, SG 1.020-1.025. Keep water quality stable with moderate flow.
Planktivore. Frozen mysis and enriched brine shrimp in small amounts several times a day; live food from a refugium helps.
Harmless to corals and invertebrates. Somewhat assertive; males fight fiercely, so keep one male. Avoid housing with small, timid fish.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Squareback Anthias is 22〜26℃. Avoid sudden temperature changes and maintain a stable environment.
Squareback Anthias typically reaches Up to 20 cm as an adult. Size may vary depending on care conditions and individual genetics.
Squareback Anthias feeds on: Frozen mysis, enriched brine shrimp, copepods, pellets. Aim for a balanced diet with appropriate feeding frequency.
The price of Squareback Anthias varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 15, 2026