Yellow Tang
Zebrasoma flavescens
A brilliant yellow algae-grazing tang that needs lots of swimming room.
| Difficulty | Intermediate |
| Min. Tank Size | 300 L |
| Temperature | 24.0–27.0 °C |
| pH Range | 8.1–8.4 |
| Max Size | 20.0 cm |
| Lifespan | 10-20 years |
| Diet | Herbivore |
| Temperament | Semi-aggressive |
Overview
The Yellow Tang (Zebrasoma flavescens) is a brilliant yellow algae-grazing tang that needs lots of swimming room. It is a popular choice among Australian aquarists, reaching around 20 cm and living roughly 10-20 years when properly cared for.
This complete guide covers how to keep the Yellow Tang successfully - tank size and setup, water parameters, the best foods (including recommended brands), suitable tank mates, breeding, sexing and the health issues to watch for. It is rated Intermediate to care for.
Natural Habitat & Origin
This is a saltwater species from tropical coral reefs. It requires a stable, mature marine aquarium with correct salinity (around 1.024-1.026), excellent filtration and pristine water.
Matching the temperature, water chemistry and cover a species evolved with is the simplest route to keeping it healthy and seeing its natural behaviour and colour.
Tank Size & Aquarium Setup
Provide a minimum of 300 litres for the Yellow Tang. Give it a large footprint with sight-breaks and cover to reduce territorial aggression.
Live plants, driftwood and shaded retreats give security and show off the fish's colours against a natural backdrop.
Always add fish only to a fully cycled, mature tank with stable biological filtration. Match filtration generously to the fish's size and waste output.
Water Parameters
Keep the Yellow Tang in stable water at 24-27 °C with a pH of 8.1-8.4. It prefers harder, alkaline water, which matches much of Australia's tap supply.
Test regularly: ammonia and nitrite must read zero, and nitrate should be kept low with routine partial water changes. Always dechlorinate and temperature-match new water, because sudden swings cause far more illness than water that is stable but slightly imperfect.
Diet & Feeding
The Yellow Tang is a herbivore and grazer that needs a plant- and algae-based diet rather than meaty foods it cannot fully digest.
In Australia, good options include Hikari Marine and Dymax frozen marine foods such as mysis and brine shrimp (note the mandarin dragonet needs a mature tank full of live copepods). Feed small amounts once or twice a day (only what is cleared in a minute or two), vary the diet for the best colour and health, and avoid overfeeding, which is the leading cause of poor water quality.
Temperament & Tank Mates
The Yellow Tang is semi-aggressive: generally community-tolerant but territorial at times, especially when breeding or under-stocked. Avoid very small, slow or long-finned tank mates and give everyone space.
Breeding
The Yellow Tang is rarely or not bred in the home aquarium; most stock is commercially farmed or wild-collected, and home breeding is considered very difficult.
Even if you are not planning to breed it, recognising this behaviour helps you understand what you are seeing and respond well - for example by adding cover for fry or giving a guarding pair extra space.
How to Tell Males from Females
Sexing depends on the species; some change sex, others show size or colour differences only when paired.
Common Health Problems
Marine fish are prone to marine ich (Cryptocaryon) and velvet; quarantine new arrivals and keep salinity and water quality rock-stable. Quarantine new arrivals for 2-4 weeks and watch daily for early signs such as loss of appetite, unusual hiding, clamped fins or laboured breathing - caught early, most issues are very treatable.
Prevention beats cure: keep water pristine, avoid overstocking and overfeeding, quarantine new arrivals, and act at the first sign of trouble.
Is the Yellow Tang Right for You?
The Yellow Tang suits keepers with some experience and a stable, mature, appropriately sized tank, as long as you can provide at least 300 litres, water at 24-27 °C and pH 8.1-8.4, the right diet and suitable tank mates.
Meet those needs and the Yellow Tang will reward you for around 10-20 years. Use our free aquarium calculators to plan your setup, and explore our other fish, plant and disease guides to build a thriving aquarium.
How to Tell Males from Females
Sexual dimorphism is limited. Females tend to be fuller-bodied when in breeding condition and males slightly slimmer or more intensely coloured, but reliable sexing generally requires mature fish observed side by side, or spawning behaviour.
