Why is my Purple Tang losing its colour?

Colour loss is typically a sign of stress, poor water quality, or a nutritional deficiency. Ensure their diet is heavily supplemented with varied marine algae (nori) and check that water parameters remain stable and pristine.

Can I keep a Purple Tang with a Yellow Tang?

It is generally not recommended unless the aquarium is exceptionally large (over 800 litres). Because both are Zebrasoma species with similar body shapes, they will fiercely compete for territory and resources.

Does the Purple Tang eat coral?

No, the Purple Tang is completely reef-safe. It is a dedicated herbivore that will spend its time grazing on microalgae and macroalgae, ignoring your corals and invertebrates.

Are the spines near their tail venomous?

The scalpel-like spines on the caudal peduncle are incredibly sharp but not venomous. They are used purely for physical defence and territorial disputes, so care must be taken when netting or handling the fish.

How fast do Purple Tangs grow?

In a spacious aquarium with excellent nutrition, they grow relatively quickly during their first two years, eventually slowing down as they approach their maximum adult size of around 25 cm.

MarineMarineIntermediate

Purple Tang

Zebrasoma xanthurum

The Purple Tang is a striking, energetic marine fish celebrated for its vibrant violet-blue body and contrasting bright yellow tail.

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Ideal Conditions

Temperature: 24 – 28 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.02 – 1.025 SG
Adult size: 20 – 25 cm
Minimum tank size for a single adult: 450 litres+
Lifespan: 10 – 15 years
Diet: Herbivore
Water flow: High
Preferred setup: Ample live rock for grazing and territory, balanced with large open swimming spaces.

About the Purple Tang

Hailing primarily from the Red Sea, the Purple Tang (Zebrasoma xanthurum) is highly prized by aquarists for its breathtaking colouration. Its deep purple-to-indigo body is offset dramatically by bright yellow pectoral and caudal fins. While undeniably beautiful, it carries a reputation for being somewhat pugnacious. They are energetic, powerful swimmers that command attention and require substantial swimming space to truly thrive.

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Is it right for your tank?

Check Purple Tang against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Purple Tang comes from

Native range

Red Sea, Persian Gulf, Arabian Sea, Gulf of Aden

Countries / regions

Egypt, Saudi Arabia, Yemen, Oman, Maldives

Habitat

Coral-rich shallows and rocky coastal areas, typically in highly oxygenated, wave-washed zones where filamentous algae thrive.

Most heavily associated with the Red Sea, though their range naturally extends out towards the Maldives and Sri Lanka.

Similar species

Yellow Tang
Zebrasoma flavescens
Sailfin Tang
Zebrasoma veliferum
Black Tang
Zebrasoma rostratum

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Clownfish occupy a different swimming zone and do not compete for grazing areas, making them excellent, peaceful companions.
Great
Fairy Wrasses
Cirrhilabrus spp.
Their completely different body shape and diet mean the tang will generally ignore them.
Great
Flame Angelfish
Centropyge loricula
Dwarf angelfish also graze on live rock, which can occasionally trigger territorial disputes over feeding grounds.
Compatible with caution
Yellow Tang
Zebrasoma flavescens
Being congeners with a similar body shape, severe aggression and fighting are almost guaranteed unless housed in an exceptionally large system.
Not recommended
Lined Seahorse
Hippocampus erectus
The tang is far too fast and active, which will stress the seahorses and outcompete them for food.
Not recommended

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