Square Yellow Anthias Female

Square Yellow Anthias Female

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Square (Yellow) Anthias (Pseudanthias pleurotaenia), is also known as the Squarespot, Purple Blotch Basslet, Squareblock, Square, or Mirror Anthias. Female Square (Yellow) Anthias are beautiful and popular fish in the aquarium trade. Females are overall a yellow to orange and Male Squareback Anthias fish display a pinkish red with a lighter rectangular patch in the center body. Here is a care guide for female Square (Yellow) Anthias

Tank Requirements:

Square (Yellow) Anthias require a tank of at least 75 gallons, with plenty of open swimming space and rock formations for hiding and perching. A well-filtered aquarium with a strong water flow is also essential.

Water Parameters:

The ideal water parameters for Square (Yellow) Anthias are a pH level of 8.1-8.4, a temperature range of 72-78°F (22-26°C), and a salinity level of 1.020-1.025.


Square (Yellow) Anthias are carnivores and need a diet of meaty foods such as frozen or live shrimp, krill, and small pieces of fish. It is recommended to feed them multiple small meals throughout the day.


Square (Yellow) Anthias are peaceful fish and can be kept with other peaceful fish, but should not be kept with aggressive or territorial fish. They are known to form harems with one male and multiple females, so it is recommended to keep at least 3-4 females together.


Square (Yellow) Anthias require moderate to high lighting to maintain their bright yellow coloration.

Water Changes:

Regular water changes of 10-20% every 1-2 weeks are recommended to maintain good water quality.

Disease Prevention:

Square (Yellow) Anthias are susceptible to diseases like other fish. Quarantining new fish before adding them to the main tank, maintaining good water quality, and providing a healthy diet can help prevent diseases.


Breeding Square (Yellow) Anthias in the home aquarium is difficult and not commonly achieved. In the wild, they form harems with one male and multiple females, with the male defending the territory and breeding with the females.

Overall, with proper care, Square (Yellow) Anthias can make beautiful and rewarding additions to a marine aquarium.