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Achilles Tang© FakirNL / CC BY-SA 4.0

Achilles Tang

The Achilles Tang is a striking surgeonfish from the reef edges of Pacific island waters, its near-black purplish-brown body set off by a vivid orange teardrop-shaped mark at the base of the tail and a bright orange tail fin. It favors shallow, wave-swept areas and is an active, energetic swimmer that brings constant motion to a tank. Growing to a maximum of about 24 cm, it needs enough swimming room as it matures. Because it requires strong water flow and high dissolved oxygen levels, and tends to be prone to white spot disease, it is generally considered a fish suited to experienced aquarists comfortable with careful water quality management. Its bold coloration and confident presence have made it a longtime favorite among seasoned marine keepers.

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About Achilles Tang

The Achilles Tang is a Pacific surgeonfish with a dark purplish body, an orange teardrop mark, and an orange tail fin. It needs strong water flow and high oxygen levels, making it an advanced-level marine fish. Here's what to know before bringing one home.

7 things to know before welcoming a Achilles Tang

  1. 1Needs Strong Water Flow

    Achilles Tangs come from wave-swept shallows, so a tank needs a pump capable of producing strong current. Without enough flow, they struggle to show their naturally active swimming behavior.

  2. 2Prefers High Dissolved Oxygen

    Given its natural habitat, this fish prefers oxygen-rich water. Combining a protein skimmer with strong circulation pumps helps keep dissolved oxygen levels high.

  3. 3Prone to White Spot Disease

    Among surgeonfish, this species is considered especially susceptible to white spot disease (ich). Careful acclimation and avoiding sudden shifts in water quality or temperature are key to long-term care.

  4. 4Grows Up to 24 cm

    Adults reach a maximum size of about 24 cm. Consider tank dimensions that offer plenty of swimming room before bringing one home.

  5. 5Active, Energetic Swimmer

    This is a curious, active swimmer. It tends to be territorial toward its own kind and similarly shaped tangs, so care is needed when planning tankmates.

  6. 6Stable Water Quality Matters

    It tends to be sensitive to changes in water quality and temperature. Regular water changes and consistent parameter checks help maintain the stable environment it needs.

  7. 7Best Suited to Experienced Keepers

    Because it combines a need for strong flow, high dissolved oxygen, and susceptibility to ich, it is generally regarded as a fish for experienced marine aquarists. Setting up the right environment before arrival is essential.

Frequently asked questions about Achilles Tang

Q.Can beginners keep an Achilles Tang?
A.It generally requires strong water flow, high dissolved oxygen, and is prone to white spot disease, so it's considered a fish for experienced keepers. It's best to gain marine aquarium experience before adding one.
Q.What should I watch for when keeping tankmates?
A.It's active and territorial, so pairing it with its own kind or similarly shaped tangs can lead to fighting. If mixing tankmates, consider tank size and layout carefully.
Q.How large a tank does it need?
A.Adults reach up to about 24 cm and are active swimmers, so a larger tank that offers plenty of swimming room is well suited.
Q.Why is white spot disease a particular concern?
A.The Achilles Tang is considered especially prone to white spot disease among surgeonfish. Careful acclimation and avoiding sudden shifts in water quality or temperature are especially important.
Q.Is the Achilles Tang covered by CITES?
A.No, the Achilles Tang is not covered by CITES.

Useful tools for Achilles Tang care

💧Aquarium Volume CalculatorCalculate water volume, weight, and heater wattage from tank dimensions🧪Water Quality CheckerFind compatible fish, shrimp, plants & corals based on pH, temperature & hardness🍽️Feeding GuideCheck feeding frequency, portion sizes & supplements by species and growth stage🤝Compatibility CheckerCheck compatibility between two species on a 5-level scale📊Fish Compatibility MatrixCheck fish compatibility at a glance with our matrix chart🔄Nitrogen Cycle GuideAuto-calculate bacteria colonization timeline for new tank cycling🗓️Seasonal Care CalendarMonthly care events and seasonal management tips at a glance🚿Water Change CalculatorAuto-calculate optimal water change frequency and volume by tank size and fish count🐠Stocking CalculatorCalculate max fish capacity for your tank size with overstocking alerts🏞️Tank Layout PlannerGet substrate, plant & hardscape suggestions based on tank size and style🧮Care Cost SimulatorEstimate initial, monthly & annual costs by category, care level and quantity⚖️Species Comparison ToolCompare two species side by side: care difficulty, size, lifespan & temperature🎯Pet Match DiagnosticAnswer 7 questions to find your top 3 perfect pets🚚Transport Safety CheckerCheck transport safety score and precautions by category, season, method and distance⏱️Quarantine & Acclimation TimerManage quarantine periods and acclimation steps with countdown timers. Includes recommended durations by species

Learn more about Achilles Tang in the encyclopedia

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Care difficulty, lifespan, size and diet — all basics covered.

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