Is the Squareback Anthias suitable for beginners?

This species is generally considered suited to intermediate keepers. Because it requires attention to water quality, flow, and lighting, it's best to have some marine aquarium experience before bringing one home.

How different do males and females look?

Females are yellow while males display pink to reddish-purple coloration, with a squarish light patch on their flank. The two sexes can look almost like different species.

How large does this fish get?

It's a fairly large anthias that can reach up to 20cm at full size, so plan for a tank that can accommodate its eventual growth.

What kind of lighting works best?

Overly intense lighting can cause the colors to fade, so more moderate lighting is preferable. A calmer light environment helps maintain their natural vibrancy.

Is this species subject to any regulations?

It is not subject to CITES. No special regulatory procedures are required.

Squareback Anthias

The Squareback Anthias is a large anthias species known for the squarish patch of bright color that appears on the male's flank. Females are a vivid yellow, while males shift toward pink and reddish-purple, giving the species a striking contrast between sexes. In the wild, they gather in loose groups along current-swept slopes in deeper water, and aquarium specimens often retain a similar relaxed, schooling demeanor. Because their colors tend to fade under overly intense lighting, they do best in tanks with moderate rather than harsh illumination. Reaching up to 20cm, they offer an impressive presence and a long window to watch their coloration develop, and are generally considered suited to keepers with some prior experience.

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About Squareback Anthias

Squareback Anthias display striking sexual dimorphism, with pink-purple males and yellow females, growing up to 20cm. Colors hold best under moderate lighting, making it a species suited to intermediate marine keepers.

7 things to know before welcoming a Squareback Anthias

1Distinct Male and Female Colors
Males display pink to reddish-purple tones while females are yellow, making the sexes easy to tell apart. The squarish light patch on the male's flank is a signature feature, and its coloration can shift subtly as the fish matures.
2Keep Lighting Moderate
Overly bright lighting can cause their colors to fade over time. Housing them under gentler illumination helps preserve their vivid hues.
3A Natural Schooling Habit
In the wild, they gather in groups along current-swept slopes in deeper water. Keeping several together in the aquarium lets them display their natural, relaxed schooling behavior.
4Grows Up to 20cm
This is a fairly large anthias that can reach up to 20cm at full size. Plan for a tank with enough volume and swimming space to accommodate their eventual growth.
5Prefers Moderate Water Flow
Since their natural habitat is along current-swept slopes, they tend to appreciate some water movement in the tank. Steady flow from a pump can help them settle in comfortably.
6Intermediate Difficulty Level
Attention to water quality, flow, and lighting makes this a fish best suited to keepers with some prior marine experience.
7Choosing Tankmates Carefully
Given their schooling nature, planning tankmates with compatible temperaments, including conspecifics or related species, helps bring out their natural, settled behavior.

Frequently asked questions about Squareback Anthias

Q.Is the Squareback Anthias suitable for beginners?: A.This species is generally considered suited to intermediate keepers. Because it requires attention to water quality, flow, and lighting, it's best to have some marine aquarium experience before bringing one home.
Q.How different do males and females look?: A.Females are yellow while males display pink to reddish-purple coloration, with a squarish light patch on their flank. The two sexes can look almost like different species.
Q.How large does this fish get?: A.It's a fairly large anthias that can reach up to 20cm at full size, so plan for a tank that can accommodate its eventual growth.
Q.What kind of lighting works best?: A.Overly intense lighting can cause the colors to fade, so more moderate lighting is preferable. A calmer light environment helps maintain their natural vibrancy.
Q.Is this species subject to any regulations?: A.It is not subject to CITES. No special regulatory procedures are required.