Yellow Tang

This page is educational reference material for preparing questions. A licensed veterinarian examines the animal, makes the diagnosis, and sets the treatment.

Yellow tangs, Zebrasoma flavescens, are the Hawaiian surgeonfish people recognize on sight. Adults reach about 8 inches, carry a spine near the tail, and live a decade or more when the tank is large and the diet is algae. They are active, semi-aggressive, and reef safe in the sense that they are herbivores rather than coral predators. Care level is intermediate because of size and diet, not because the fish is fragile in clean water.

Length, algae, and one tang

Give an adult 100 gallons or more, longer rather than tall, with live rock to graze and open water to cruise. Temperature 72 to 82°F, salinity 1.020 to 1.025, pH 8.1 to 8.4, nitrate as low as a reef keeper can manage. Clip dried seaweed in the tank daily. Herbivore preparations and occasional mysis round it out. Head and lateral line erosion, the pitted look around the face, is strongly tied to a poor diet and dirty water.

Keep a single yellow tang unless the tank is huge. They fight their own species and sometimes other tangs. Captive-bred fish are the responsible buy and cost more up front than a wild adult that may arrive with ich.

Money and quarantine

Ignore any setup figure that prices a 100-gallon marine tank like a freshwater kit. Rock, a stand, lighting, a protein skimmer, salt, and a heater land in the thousands for most people buying new. The fish itself, captive-bred, is often a few hundred dollars. Quarantine new arrivals. Cryptocaryon in a reef full of invertebrates is miserable to treat.

This is not a beginner marine fish. A person who has already kept clownfish and can grow algae on purpose can keep one. Scratching, rapid breathing, or hiding with color loss means test the water and read the gasping page. The checker is a triage aid, not a salinity test. An aquatic veterinarian is appropriate for a fish of this price.

Yellow tang tank and diet

How big a tank does a yellow tang need?

About 100 gallons or more for an adult, with open swimming length. They reach around 8 inches and they are on the move all day. A 30-gallon cube is a quarantine, not a home.

What do they eat?

Algae. Offer dried nori on a clip every day, plus herbivore pellets and spirulina foods. A tang on flake food alone is how head and lateral line erosion starts.

Are they reef safe?

Yes, toward corals, with the usual caution that a hungry tang may sample a fleshy coral. They are not peaceful toward other yellow tangs in a small tank.

Why is the setup more than a few hundred dollars?

A 100-gallon marine system, stand, lights, rock, salt, and skimmer routinely costs $1,500 to $4,000 before the fish. Captive-bred juveniles often run $200 to $500.