Not furry, but we like them anyway.
Mimic Tang
Acanthurus pyroferus
Also called Chocolate surgeonfish, Mimic surgeonfish, Chocolate tang, Yellow mimic tang, Orange-gilled surgeonfish
From Tropical Indo-Pacific, from the Seychelles east to the Marquesas and Tuamotus, north to southern Japan and south to the Great Barrier Reef, New Caledonia and New South Wales; on reefs at about 2 to 60 m depth12
At a glance the quick version
Looks how to spot one
Laterally compressed surgeonfish (tang)
An oval, flat-sided tang with a crescent-shaped tail. Adults are a warm chocolate to yellowish brown with a pale ring around the mouth, a dark bar from the chin to the gill cover, an orange patch near the pectoral fin base and a white edge on the tail. Youngsters look completely different, wearing the bright yellow or yellow-and-black colours of small dwarf angelfish.213
Personality what they are like
An active, generally peaceful grazer that tends to live alone on the reef. Youngsters can share space, but grown fish become more territorial, so it is best kept as a single tang in a roomy tank.123
Daily activity how busy a day looks
An active open-water swimmer that needs plenty of free swimming room plus rockwork with crevices to retreat into and sleep in.3
Grooming and care the hands-on bits
Rated easy care by a specialist retailer. Keep good water flow, run a protein skimmer and make regular water changes. Let some algae grow for grazing and acclimate it slowly.3
Home where they are happiest
A large marine aquarium of around 450 to 500 litres (a retailer suggests 120 US gallons) with lots of live rock, open swimming space and strong water movement. Suggested water: 23 to 28 C, pH 8.1 to 8.4, specific gravity 1.020 to 1.025. Reef safe with corals and invertebrates.3
Food basics what goes in the bowl
A herbivore that grazes algae and detritus in the wild. In the aquarium offer marine algae such as nori or spirulina sheets every day, plus quality herbivore flakes, pellets and frozen foods.123
Company who they like around
Usually seen singly in the wild. Keep one per tank, and add other tangs only with care in very large systems, since adults defend their space.123
The story where it all began
The species was described in 1834 by the Prussian naturalist Heinrich von Kittlitz from specimens taken in the Caroline Islands. It has long been noted by divers and scientists for the way its young copy different dwarf angelfish depending on where they live, and it is regularly kept in reef aquariums.21
Fun facts for the dinner table
- 1
Young mimic tangs dress up as whichever dwarf angelfish lives nearby: around Guam they copy the yellow lemonpeel angelfish, while in Palau, where that angel is missing, they copy the pearlscale angelfish instead.1
- 2
Where both model angelfish live, as in Vanuatu, juveniles may copy either one or even look like a blend of the two.2
- 3
FishBase records a maximum age of 28 years for this species.1
- 4
Adults can reach about 29 cm long, so the little yellow youngster grows into a sizeable tang.1
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed May 2010)1
- Taxonomy
- First described by Heinrich von Kittlitz in 1834, type locality the Caroline Islands2
The care rhythm a typical week and year
A typical home-care rhythm for a Mimic Tang. A starting point, not a vet's advice.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Salinity checkevery week
- Top-upTop up evaporation with fresh RO water, not salt waterevery day
- Water testevery week
- Water changeAbout 10 to 20% of the waterevery 2 weeks
- Glass cleanevery week
Owner questions the things everyone asks
How often should I feed my Mimic Tang?
Feed your Mimic Tang small amounts once or twice a day. Furry Diary's starting plan suggests daily feeding. This active grazer will appreciate regular meals of marine algae.123 Pet Wiki plan
What does a Mimic Tang eat, and what should it never eat?
Your Mimic Tang is a herbivore that loves marine algae like nori or spirulina sheets, plus quality herbivore flakes, pellets, and frozen foods. Never feed it anything not meant for herbivorous marine fish; always check with your vet or a good breeder for specific foods to avoid.123
How much space does a Mimic Tang need?
This active swimmer needs a large marine aquarium of around 450 to 500 litres (about 120 US gallons). Provide plenty of open swimming room plus rockwork with crevices for retreat and sleep.3
What temperature, light or water does a Mimic Tang need?
Keep water temperature between 23 and 28°C, pH 8.1 to 8.4, and specific gravity 1.020 to 1.025. Strong water movement is important, and the tank is reef safe with corals. Furry Diary's plan includes daily temperature checks and weekly salinity checks.3 Pet Wiki plan
How often should I clean a Mimic Tang's home?
Furry Diary's plan suggests cleaning the glass weekly and doing a 10 to 20% water change every two weeks. Also run a protein skimmer and let some algae grow for grazing.3 Pet Wiki plan
Can a Mimic Tang live with others?
It is best kept as a single tang in a roomy tank, as adults become territorial. Youngsters can share space, but add other tangs only with care in very large systems. It is generally peaceful with corals and invertebrates.123
How long does a Mimic Tang live?
With good care, your Mimic Tang can live between 15 and 28 years. This long lifespan makes it a wonderful long-term companion.31
Can I handle a Mimic Tang?
Handling is not recommended as this is a delicate fish that can be stressed easily. Always use a container or net if you need to move it, and consult a good breeder or vet for safe handling tips.
Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.
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Lemonpeel AngelfishWhere this comes from
Every fact on this page has a numbered source. Spotted an error? [email protected].
- FishBase: Acanthurus pyroferus fishbase.seused for range, size, depth, diet, mimicry, max age, IUCN
- Wikipedia: Acanthurus pyroferus en.wikipedia.orgused for names, description, history, colours, mimicry
- Saltwaterfish.com: Yellow Mimic (Chocolate) Tang saltwaterfish.comused for aquarium care, tank size, water parameters, diet, lifespan
Checked 2026-09-30. Text is written in our own words from these sources.