Desjardini Sailfin Tang

Zebrasoma desjardini

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 Desjardini Sailfin Tang

General information

The Desjardini Sailfin Tang is dark to very light gray in color with light freckles on the nose and yellow freckles on the abdomen. The body has several, varying sized vertical yellow stripes with intricate markings between the stripes at the face. It has a blue tail with white freckles. Its appearance can practically double in size at will by raising or lowering its sizable dorsal and anal fins. A large aquarium is necessary to provide plenty of swimming room. It is aggressive towards its own species and conspecifics at times, but peaceful towards other fish, so keep only one except in a very large tank. The Small Juvenile form of the Desjardini Tang may not have spots on the fins or body and are very similar in appearance to a Sailfin Tang. However, with age, the spots will develop as well as the bold striping on their fins and body.

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