Red Sea Purple Tang

Zebrasoma xanthurum

Saltwater Fish Species Group: Tang and Surgeons Family: Acanthuridae

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Water parameters

Temp 76-80 F Temperature

Maintaining a stable and appropriate temperature is critical for the survival of aquatic life.

pH 7.8 - 8.4 potential of Hydrogen

Measuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.

NO3 1-20 ppm Nitrate

While less toxic than ammonia, high nitrate levels (above 40–80 ppm) are important to monitor because they can cause fish stress, stunted growth, and harmful algae blooms.

NO2 <0.0001 ppm Nitrite

It is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia

PO4 0.01 - 0.1 ppm Phosphate

It is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.

NH3 <0.1 ppm Ammonia

It is the primary killer of aquarium fish, causing gill damage, stress, and death

Ca 380 - 450 ppm Calcium

Supporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae

KH 8 - 12 dKH Alkalinity

It acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.

Mg 1200 - 1400 ppm Magnesium

It enables coral growth by supporting skeletal formation, assists in metabolic processes, and ensures that calcium is available for corals, clams, and coralline algae.

SG 1.023 - 1.026 SG Salinity

Essential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals

ORP 250 - 400 mV Oxidation-Reduction Potential

A higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.

About Red Sea Purple Tang

General information

The Purple Tang is blue to purple in color with a yellow tail and yellow accents on the pectoral fins. This fish was formally known only to the coral reefs of the Red Sea, but it is now found in the Arabian Sea, the Gulf of Aden and in the waters off Sri Lanka as well. It usually lives singly, but can occasionally be found in schools in the southern Red Sea. Adults can reach a size of 10 inches. The Purple Tang is one of the most prized specimens of all saltwater fish for its coloration, and one of the most popular Tangs for the reef aquarium. If housed properly, it is a rewarding and attractive addition to any large fish-only tank or reef aquarium. If keeping them, be sure to provide good lighting, lots of free-swimming space and plenty of potential hiding spots. They can be very aggressive and do not fare well with tank mates of similar body shape, especially other Tangs of the genus Zebrasoma.

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