Auriga Butterflyfish
Auriga Butterflyfish
Goes well with:
FAQs Answers to the most common questions.
Can I keep an Auriga Butterflyfish in a reef tank, and if so, which corals are at the highest risk of being eaten?
Auriga Butterflyfish are generally not reef safe. They are strong pickers and will usually go after large-polyp stony (LPS) corals such as acans, scolies, euphyllia (hammers, torches, frogspawn), and open brains, as well as many soft corals like zoanthids and fleshy leathers. They also frequently nip at clam mantles and feather dusters. Small-polyp stony (SPS) corals can sometimes be less attractive to them, but there is no guarantee; individuals vary, and many will still graze on SPS polyps. If you try them in a reef, you should be prepared to remove either the fish or the corals if nipping becomes persistent.
My new Auriga Butterflyfish is ignoring prepared foods and only picking at rocks; how do I get it to start eating in captivity?
Newly imported Auriga Butterflyfish often rely on natural grazing and may not recognize prepared foods at first. Start with live or very enticing foods such as live blackworms, live brine shrimp (enriched), and frozen mysis shrimp. Offer small, frequent feedings and keep flow gentle when feeding so food stays in the water column longer. You can rubber-band fresh clam or mussel meat (on the half shell) and raw shrimp to a rock to stimulate natural picking behavior. Over several days, gradually mix in finely chopped seafood, high-quality frozen angel/butterfly blends, and finally small pellets soaked in garlic or vitamin supplements. Make sure there is mature live rock with natural growth to support grazing while it learns to accept prepared food.
How large a tank does an adult Auriga Butterflyfish really need, and what aquascape layout suits its swimming and grazing behavior?
Although they are sometimes sold as suitable for 75-gallon tanks, an adult Auriga Butterflyfish is an active swimmer that does best in at least 120 gallons (4 feet long minimum, 5–6 feet preferred). They cruise constantly, picking at rock surfaces, so provide long, open swimming lanes with rock structures arranged as islands or a shallow wall rather than a solid, tall “wall of rock.” Include multiple arches and overhangs so the fish can retreat if stressed, but avoid cramped mazes that force sharp turns. A moderate amount of established live rock with ample surface area for algae and invertebrate growth will support natural foraging, which keeps them calmer and in better condition.
Is it safe to keep more than one Auriga Butterflyfish together, and what tankmates work best or should be avoided?
In home aquaria, Auriga Butterflyfish are usually kept singly. They can be aggressive to conspecifics and similar butterflyfish, especially in smaller tanks. In very large systems (220 gallons and up), you can sometimes keep a pair or small group if they are introduced together and there are multiple rock structures to establish territories, but success is not guaranteed. As for tankmates, they generally do well with peaceful to moderately assertive community fish like tangs, wrasses, and peaceful angelfish. Avoid very aggressive species (large triggers, large damsels, overly dominant tangs) that may outcompete or bully them, as well as very tiny, delicate fish that could be harassed by constant picking. Also avoid housing them with other butterfly species that share similar patterns and feeding niches unless the tank is very large.
Why does my Auriga Butterflyfish’s dorsal “banner” sometimes look shorter or frayed, and is this a health concern?
The elongated dorsal filament on Auriga Butterflyfish is easily damaged during capture, shipping, or rough contact with rockwork and tankmates. A shortened or frayed banner is common and does not necessarily indicate poor health, as long as the fin tissue is clear (not cloudy) and free of redness, white fuzzy growth, or ragged edges from fin rot. Good water quality, low aggression, and a vitamin-rich, varied diet will allow the fin to heal and regrow to some extent, though it may never look as long or perfect as in wild specimens. If you see rapid deterioration, redness at the fin base, or the fish clamping its fins and breathing heavily, check for bacterial or parasitic disease and address water quality immediately.
All listed sizes are approximate, not guaranteed, and may vary slightly.
The Auriga Butterflyfish, Chaetodon auriga, also known as the Threadfin Butterflyfish, is a beautifully patterned saltwater fish distinguished by its bright white body, intersecting dark chevron markings, yellow posterior coloration, and bold black band running through the eye. Most populations display a prominent black eyespot near the rear of the dorsal fin, while mature specimens develop the elegant thread-like dorsal extension responsible for the Threadfin common name.
Native to an exceptionally broad Indo-Pacific range extending from the Red Sea and East Africa to Hawaii and French Polynesia, this species inhabits coral reefs, lagoons, rubble zones, and other structured marine habitats. It may occur singly, in pairs, or in loose groups while roaming the reef in search of small invertebrates, coral polyps, algae, and other foods.
Reaching approximately 10 inches as an adult, the Auriga Butterflyfish is an active and eye-catching marine aquarium fish best suited to a spacious fish-only or fish-only-with-live-rock aquarium. It is generally adaptable for a butterflyfish once established and feeding well, but its natural feeding behavior makes it an unsuitable choice for most reef aquariums containing valuable corals and sessile invertebrates.
Quick Care Guide
Care Level: Moderate
Minimum Tank Size: 125 gallons
Temperament: Peaceful
Diet: Omnivore
Reef Safe: No
Region: Indo-Pacific – Red Sea and East Africa to Hawaii and French Polynesia
Scientific Name: Chaetodon auriga
Tank Requirements
Provide a spacious, established marine aquarium with a combination of open swimming room and substantial rockwork. Caves, overhangs, and sheltered passages allow the fish to retreat when desired, while broad open areas accommodate the continuous cruising behavior typical of adult butterflyfish.
Because this species can reach approximately 10 inches, horizontal swimming space is important. Avoid creating an overly dense aquascape that restricts movement, particularly as the fish reaches adult size.
Moderate water movement, strong oxygenation, efficient filtration, and consistently stable water quality are recommended. Mature live rock can provide additional browsing opportunities and may help newly introduced specimens settle into the aquarium.
A secure lid is advisable, especially during acclimation when a startled butterflyfish may make sudden movements toward the surface.
Diet and Feeding
The Auriga Butterflyfish is an omnivore with a broad natural diet that includes polychaete worms, sea anemones, coral polyps, algae, and other small reef-associated foods.
In captivity, offer a varied selection of mysis shrimp, enriched brine shrimp, finely chopped shrimp, clam, mussel, squid, and quality frozen marine blends. Specialized butterflyfish preparations containing marine invertebrate material can provide additional dietary variety.
Spirulina-based foods, marine algae preparations, and high-quality omnivore pellets can also be included. Newly introduced specimens that are reluctant to eat may respond particularly well to clam or mussel presented on the shell, frozen mysis, or foods placed close to familiar rockwork.
Feed two to three smaller meals per day when practical to maintain good body condition.
Temperament and Tankmates
The Auriga Butterflyfish is generally peaceful toward unrelated marine fish and works well with many appropriately sized community species. Suitable tankmates can include tangs, rabbitfish, wrasses, clownfish, larger gobies, and compatible angelfish.
Territorial behavior may occur toward other butterflyfish, especially similar-looking species or additional Auriga Butterflyfish. A single specimen is the most straightforward option for most aquariums.
Adults naturally occur singly, in pairs, and occasionally in aggregations. Compatible established pairs may be maintained in sufficiently spacious systems, but two randomly selected individuals should not be assumed to form a peaceful pair.
Avoid excessively aggressive tankmates that may continually harass the butterflyfish or prevent it from feeding.
Reef Compatibility
The Auriga Butterflyfish is not considered reef safe. Coral polyps form part of its natural diet, and specimens may actively nip at or consume both stony and soft corals.
Sea anemones, feather duster worms, and other sessile invertebrates may also be investigated or eaten. Individual feeding preferences can vary, but the risk to desirable reef organisms is significant enough that this species should not be recommended for a traditional coral reef aquarium.
A fish-only or fish-only-with-live-rock system provides the most predictable long-term environment.
Water Parameters
Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH
Stable salinity, excellent oxygenation, and consistently good water quality are more important than maintaining an exact value within these ranges.
Common Considerations
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Not reef safe: Coral polyps and several types of sessile invertebrates may be consumed or repeatedly nipped.
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Large adult butterflyfish: Adults can approach 10 inches and require substantial open swimming room.
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Varied feeding is important: Offer a diverse combination of marine invertebrate foods, frozen preparations, and algae-based foods.
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Butterflyfish compatibility: Territorial behavior may occur toward other butterflyfish, particularly similar species.
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Acclimation: Newly introduced specimens may initially be cautious and benefit from abundant shelter and highly palatable marine foods.
