Yellow Tang
Zebrasoma flavescens
Yellow algae-grazer needing serious swimming spaceIntermediate
- Lifespan
- 15-30 years
- Size
- 20 cm (8 in)
- Social needs
- Best kept singly; territorial with tangs
- Time
- Daily feeding; weekly testing/changes
- Cost
- High
- Diet
- Herbivore (marine algae, nori, seaweed, veg)
Overview
What is this animal?
- The Yellow Tang is a lemon-yellow surgeonfish and one of the more recognisable marine fish.
- Captive-bred stock now exists and is the more responsible choice.
- Although hardy once settled, it is not a beginner fish: it needs a large tank, grows substantially, and is prone to disease when stressed.
- It is an active, all-day swimmer that grazes algae constantly and can live for many years.
- The name "surgeonfish" comes from a sharp scalpel-like spine at the tail base, which it can use defensively, so handle it with care during maintenance.
Temperament
- Active and generally peaceful toward unrelated fish, the Yellow Tang is territorial toward other tangs and similar-shaped fish.
- It is reef-safe and helps control nuisance algae among corals.
- Keep only one tang per tank unless the system is very large with several added together.
- Its tail spine can injure tankmates and careless hands, so respect it during maintenance.
- Given space, it is a bold, ever-moving centrepiece.
A good fit for
- Intermediate keepers with a large tank
- Reef tanks needing natural algae control
- Long-term committed aquarists
- Ethical buyers choosing captive-bred
Common mistakes to avoid
- Tanks too small for its swimming needs
- Skipping quarantine - prone to marine ich
- Insufficient algae/veg in the diet
- Housing multiple tangs that fight
Enclosure
Minimum 280 litres (74 US gallons)
Must be housed alone. Best kept singly; territorial with tangs
- Provide a long tank of at least 280L (75 gal) and ideally larger; tank length matters more than volume for this fast swimmer.
- Keep salinity 1.024-1.026, temperature 24-27°C (75-80°F), pH 8.1-8.4, and nitrate low, with strong flow and good oxygenation.
- Give plenty of rockwork for grazing and refuge.
- Add it last to an established tank, since territorial tangs claim space, and quarantine all new fish to keep marine ich out of the system.
Supplies
Setup
- Tank, stand and sump
- Return pump and powerheads
- Protein skimmer
- Reef lighting
- Rock and sand
- Salt mix, refractometer and test kits
- Quarantine tank
Ongoing
- Dried marine algae (nori) sheets in bulk
- Magnetic or suction veg clip
- Algae or herbivore pellets
- Herbivore frozen food blend
- Frozen mysis shrimp (for the small protein share)
- Vitamin or HUFA soaking supplement
- Second clip so nori can be offered in two places
Safe substrate: Aragonite sand · Dry or cured live rock · Bare bottom
Care routine
Daily
- Check salinity, temperature and flow
- Clip on dried algae
- Feed
- Head-count and look everyone over
- Top up evaporation with fresh water
Weekly
- Service the skimmer and filter socksevery 3 days
- Check head, lateral line and flanks
- Clean the glass
- Test the water
Monthly
- Water changeevery 2 weeks
- Calibrate the refractometer
- Check salt, RO/DI and reagents
Less often
- Deep-clean pumps and powerheadsevery 3 months
- Replace RO/DI filter mediaevery 6 months
Vet: Quarterly review with an HLLE check — every 3 months
Top resources for more info
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Diet
- The Yellow Tang is primarily a herbivore.
- Its diet must be algae-based: offer dried marine algae (nori) clipped in the tank daily, plus algae pellets and herbivore frozen foods.
- Grazing on natural algae growth supplements this.
- A diet too high in meaty foods causes poor health and dull colour, so keep it green.
- Frequent small feedings suit its constant grazing.
- Vitamin-enriched algae sheets help maintain colour and support the immune system.
Health
- Yellow Tangs are notably susceptible to marine ich (Cryptocaryon) and to head-and-lateral-line erosion (HLLE), which is linked to stress, poor water quality, and inadequate diet.
- Strict quarantine of all new arrivals is essential to keep ich out.
- Maintain clean water, strong oxygenation, and an algae-rich diet to help prevent HLLE.
- Watch for white spots, scratching, faded colour, or pitting along the head and lateral line.
- Good husbandry lets this fish live for many years.
Is your enclosure big enough?
Is this urgent?
In a reef, stability matters more than any single target number. A parameter moving fast does more damage than a parameter sitting slightly off.
Go now
Today
Quarantine every new animal, including corals and inverts. It is the single practice that separates a reef that lasts from a reef that restarts.
This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it — and the time to find one is before you need one.
What it really costs
Setup, monthly, first year and across a whole life, itemised and with the electricity worked out from the actual wattage. Published figures for the same animal disagree by a factor of four, so the calculator shows ranges rather than picking one.
Bedding and substrate
In a marine system the rock and the sand are life support, and how you start them decides the first six months.
Safe
With a caveat
Never
This is our general list for saltwater fish. We have not built one specific to Tangs yet.
My kit says 0.25 ppm. Is that dangerous?
A liquid kit measures total ammonia, but only the un-ionised fraction is really toxic, and that fraction is governed by pH and temperature — each whole pH unit multiplies it roughly tenfold. So the same reading can be nearly harmless in one tank and lethal in another; this works out which one you are in.
Compare with other animals
The same axes for every animal, side by side — the way the guides are written makes that a fair comparison rather than two articles.
Tangs, side by side
Same axes, same care guides — the honest way to choose between types.
See all Tangs side by side →
