Anthias – Squareback Anthias (Pseudanthias pleurotaenia)

Updated on January 30, 2021 by

Owing to their unique color variation, the Squareback Anthias has been known by many names including, Squarespot, Purple Blotch Basslet, Squareblock, Square or Mirror Anthias.

Quick stats – Squareback Anthias

Category Info
Origin Indonesia, Fiji, New Caledonia
Max size 7.75” / 20 cm
Aquarium Min. 100 gallons / 378 litres
Water 72-78° F / 22-25° C

dKH 8-12, pH 8.1-8.4

sg 1.020-1.025
Care level Moderate
Behaviour Peaceful
Diet Carnivore
Family Serranidae
Colors Red, orange, purple

Squareback Anthias description

The female Squareback Anthias possesses a yellow body with a lavender belly and a thin blue line that extends from the nose to the pectoral fin.

The male rather possesses a pink body with a lavender belly and a lighter rectangular shape on the side (just as the name implies).

As with all Anthias species, the Squareback Anthias are hermaphrodites with the most dominant and largest female morphing into a male in the absence of a male in the same group.

Squareback Anthias in the ideal aquarium

Squareback anthias - Pseudanthias pleurotaenia

Setting up the best aquarium for the Squareback Anthias will require a well filtered minimum of 100 gallon/378 litres to house a single Squareback Anthias.

However, if they should be housed in a group, a minimum of 180 gallons/681 litres will be best suitable to house a few groups of Squareback Anthias species.

As active swimmers, the tank should have lots of open space for free swimming. Squareback Anthias are reef safe and can be kept with precious corals, clam mantles and sessile invertebrates.

Squareback Anthias feeding

Squareback Anthias are carnivores with high planktivorous appetite.

They can be fed with meaty foods including live and frozen mysis shrimp, enriched frozen brine shrimp. An attached refugium that ensures the cultivation of copepods and amphipods will also provide these species with nutritious live foods.

With time they will accept high-quality flaked foods, but should be offered in small quantities throughout the day.