SeafanEmergencies

Tangs

Powder blue tang

Acanthurus leucosternon

Also sold as Powder blue surgeonfish

Not for beginners

Powder blue tang (Acanthurus leucosternon), photographed in the sea or an aquarium
Photo: Diego Delso, CC BY-SA 4.0, via Wikimedia Commons
Care level
Advanced
Adult size
22.9 cm in aquariums
Minimum tank
473 litres
Temperament
Aggressive
With corals
Reef safe
Captive-bred
Wild-caught (captive-bred rare)
IUCN status
Least Concern
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How do you care for the powder blue tang?

Very aggressive towards other tangs, especially similar ones.

Feeding

Herbivore.

Seaweed essential.

Tank and special needs

Plan for at least 473 litres of water (the care sheet says 125 US gallons). FishBase records wild fish up to 54 cm (total length); aquarium fish usually stay nearer 22.9 cm.

Large, very stable, high-oxygen tank.

Corals and invertebrates

None.

Which tankmates suit the powder blue tang?

One per tank; no similar Acanthurus.

Suggested order in a mixed tank: add last, after the peaceful fish have settled.

More than one powder blue tang

Keep one powder blue tang: two of the same species usually fight.

Other fish

Checked against the other 59 fish in this guide, assuming a tank big enough for both. Individual fish differ, so treat this as a starting point.

Avoid together (7)

  • Neon gobyPowder blue tang is aggressive and may bully the neon goby, which is small enough to be driven into hiding or killed.
  • Yellow clown gobyPowder blue tang is aggressive and may bully the yellow clown goby, which is small enough to be driven into hiding or killed.
  • Hi-fin red banded gobyPowder blue tang is aggressive and may bully the hi-fin red banded goby, which is small enough to be driven into hiding or killed.
  • Yellow tangBoth are tangs of similar shape, which is a common trigger for fights.
  • Regal blue tangBoth are tangs of similar shape, which is a common trigger for fights.
  • Kole tangBoth are tangs of similar shape, which is a common trigger for fights.
  • Scopas tangBoth are tangs of similar shape, which is a common trigger for fights.

Take care (24)

  • Ocellaris clownfishPowder blue tang is aggressive and may bully the ocellaris clownfish, especially if the bully is added first.
  • Yellow watchman gobyPowder blue tang is aggressive and may bully the yellow watchman goby, especially if the bully is added first.
  • Orange spotted gobyPowder blue tang is aggressive and may bully the orange spotted goby, especially if the bully is added first.
  • Gold head sleeper gobyPowder blue tang is aggressive and may bully the gold head sleeper goby, especially if the bully is added first.
  • Rainford's gobyPowder blue tang is aggressive and may bully the rainford's goby, especially if the bully is added first.
  • Tailspot blennyPowder blue tang is aggressive and may bully the tailspot blenny, especially if the bully is added first.
  • Pyjama cardinalfishPowder blue tang is aggressive and may bully the pyjama cardinalfish, especially if the bully is added first.
  • Green chromisPowder blue tang is aggressive and may bully the green chromis, especially if the bully is added first.
  • Yellow coris wrassePowder blue tang is aggressive and may bully the yellow coris wrasse, especially if the bully is added first.
  • Red head solon fairy wrassePowder blue tang is aggressive and may bully the red head solon fairy wrasse, especially if the bully is added first.
  • Carpenter's flasher wrassePowder blue tang is aggressive and may bully the carpenter's flasher wrasse, especially if the bully is added first.
  • Melanurus wrassePowder blue tang is aggressive and may bully the melanurus wrasse, especially if the bully is added first.
  • Leopard wrassePowder blue tang is aggressive and may bully the leopard wrasse, especially if the bully is added first.
  • Bluestreak cleaner wrassePowder blue tang is aggressive and may bully the bluestreak cleaner wrasse, especially if the bully is added first.
  • FirefishPowder blue tang is aggressive and may bully the firefish, especially if the bully is added first.
  • Purple firefishPowder blue tang is aggressive and may bully the purple firefish, especially if the bully is added first.
  • Scissortail dartfishPowder blue tang is aggressive and may bully the scissortail dartfish, especially if the bully is added first.
  • Royal grammaPowder blue tang is aggressive and may bully the royal gramma, especially if the bully is added first.
  • Yellowhead jawfishPowder blue tang is aggressive and may bully the yellowhead jawfish, especially if the bully is added first.
  • Mandarin dragonetPowder blue tang is aggressive and may bully the mandarin dragonet, especially if the bully is added first.
  • Spotted mandarinPowder blue tang is aggressive and may bully the spotted mandarin, especially if the bully is added first.
  • Moorish idolPowder blue tang is aggressive and may bully the moorish idol, especially if the bully is added first.
  • Harlequin filefishPowder blue tang is aggressive and may bully the harlequin filefish, especially if the bully is added first.
  • Copperband butterflyfishPowder blue tang is aggressive and may bully the copperband butterflyfish, especially if the bully is added first.
Usually fine together (28)

Invertebrates

Only the invertebrates with a known risk are listed.

Take care (2)

  • Tiger tail sea cucumberA stressed or dead tiger tail sea cucumber can release toxins that harm fish; cover pump intakes.
  • Sea appleA stressed or dead sea apple can release toxins that harm fish; cover pump intakes.

Corals and anemones

Only the corals and anemones with a known risk are listed.

No known problems with the corals and anemones in this guide.

These checks follow the reasons fish and invertebrates clash: same species or genus, similar shape, mouth size, temperament, food, burrows, tank size and the order they are added. Individual animals differ; every source agrees on that.

Quarantine and health

Among the most ich-prone fish; copper quarantine usually advised.

New fish are the most common way disease gets into a reef tank. Quarantine every fish in a separate tank before it joins the display, and choose a method that suits its tolerance of copper.

Captive-bred or wild?

Wild-caught.

Where sources disagree

Where sources disagree
TopicWhat sources sayOur reading
Adult size
  • FishBase records 54 cm total length.
  • A US retailer gives about 23 cm.
FishBase gives the largest wild fish recorded; aquarium fish stay much smaller.

What does it cost in the UK?

£45 to £60. This is one UK retailer’s listing on 21 October 2026, not a market average, and every item was sold out on that day.

Sources

  1. LiveAquaria (US retailer) care sheetRead 21 October 2026, read in full. Used for: stats.
  2. FishBase species summaryRead 21 October 2026, read in full. Used for: max length.
  3. Kraken Corals (UK retailer) catalogueRead 21 October 2026, read in full. Used for: UK price small.
  4. Kraken Corals (UK retailer) catalogueRead 21 October 2026, read in full. Used for: UK price medium.

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