Tangs · Acanthuridae
Care levelExpert
Mustard Tang
Acanthurus guttatus
Pale bands cross the front of a dark body, with white spots across the rear and contrasting yellow fins. This distinctive surgeonfish needs a large, established aquarium. Reef suitability should be assessed with caution rather than assumed.
Large adult space, a substantial feeding routine and the linked retailer's cautious reef classification justify a conservative Expert approach.
Recommendation
Would you recommend this fish for a suitable saltwater aquarium?
250+ galRecommended tank
12 inchesAdult size
Semi-aggressive / territorialTemperament
With cautionCoral safety
+ Why you’ll love them
- Pale bands cross the front of a dark body, with white spots across the rear and contrasting yellow fins.
- Grazes marine algae as part of a balanced feeding plan.
- Distinctive combination of pale bands, white spots and yellow fins.
! Things to consider
- Needs adult-sized housing: plan for 250 US gallons or more with suitable swimming space.
- Large adult space, a substantial feeding routine and the linked retailer's cautious reef classification justify a conservative Expert approach.
- Requires a consistent feeding routine and stable water.
- Has sharp tail spines; handle carefully.
Tank and habitat
- Recommended volume
- 250 US gallons or larger; allow for stocking and layout.
- Full-grown size
- 12 inches (maximum adult size)
- Tank footprint and swimming space
- Choose a long rectangular aquarium with open swimming lanes and room to turn. Leave space around rockwork; a tall narrow tank is a poor substitute for swimming length.
- Tank maturity
-
6 months recommended
Use an established, fully cycled aquarium with stable filtration and productive grazing surfaces. Confirm water stability and reliable feeding access before introduction. Suggested tank age is a planning guide, not proof of readiness. Complete cycling, stable water and the right food supply are essential. - Habitat and equipment
- Provide good circulation and gas exchange. Arrange secure rockwork for shelter and grazing, keep open water available, and use a secure lid. Take care around the sharp tail spines.
Care and compatibility
- Temperament
- Semi-aggressive / territorial
- Why this care level
- Large adult space, a substantial feeding routine and the linked retailer's cautious reef classification justify a conservative Expert approach.
- Suitable tank mates and conflicts
- Many appropriately sized marine community fish may be suitable. Other tangs, especially similar-shaped species, require particular care and substantially more space.
- Alone, pair or group
- A single tang is the simpler plan. Keeping several requires additional space, individual assessment and a way to separate incompatible fish; wild groups do not establish an aquarium stocking rule.
Corals and invertebrates
- Coral safety
-
With caution
The linked retailer classifies reef compatibility with caution. Evaluate the individual and your specific corals; monitor grazing and picking, and be ready to separate if needed. - Shrimp safety
-
Generally compatible
Generally compatible with ornamental shrimp; monitor introductions and individual behavior. - Snail safety
-
Generally compatible
Generally compatible with snails. Continue observing grazing behavior around small invertebrates. - Clam safety
-
With caution
Use caution and monitor mantle picking or irritation. A broad reef label does not establish compatibility with every clam.
Food and feeding
- Diet
- Herbivore; marine algae and varied prepared foods
- Feeding plan
- Offer regular marine algae and varied suitable herbivore preparations with mature grazing surfaces. Offer food consistently and check body condition; natural grazing is a supplement, not a complete feeding plan.
- Prepared or live food
- Marine algae sheets, suitable herbivore pellets and varied marine frozen preparations can be offered. Confirm the individual accepts the foods you can provide.
Water conditions
- Temperature
- 72–78 °F (22–26 °C) is a commonly published aquarium reference range. Maintain stable conditions and consider the needs of the whole community.
- Specific gravity
- Specific gravity 1.021–1.025 is the reference range on the linked retailer profile. Avoid abrupt changes and match the needs of the whole aquarium.
- pH
- pH 8.1–8.4 is the published marine aquarium reference range used here; maintain stability rather than chasing a single reading.
Long-term care
- Lifespan
- The linked references do not establish a reliable typical captive lifespan for this profile. Plan for long-term care and maintain a realistic adult housing commitment.
- Growth and future planning
- Adults may reach about 12 inches. Growth depends on the individual and conditions; juvenile purchase size should not determine the long-term aquarium.
Before you buy
- Is this fish right for your tank?
- Plan adult housing and evaluate the specific reef livestock you intend to keep; a broad reef-safe label is not a guarantee.
- Buying checklist
- Ask to see the fish eat. Look for a well-filled body, clear eyes, intact fins and normal swimming and breathing. Plan quarantine and confirm the seller’s species identification and feeding routine.
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