Not furry, but we like them anyway.
Heniochus Butterflyfish
Heniochus diphreutes
Also called Schooling bannerfish, False moorish idol, Pennant butterflyfish
From Indo-Pacific: Red Sea and South Africa east to Indonesia, Japan, Australia and Hawaii, though missing from much of Oceania1
A friendly guide, not veterinary advice. For anything about your pet's health, ask your vet.
At a glance the quick version
Looks how to spot one
Tall, compressed butterflyfish with a long dorsal banner
A white body crossed by two wide black diagonal bands, with yellow fins toward the back. A very long white filament trails from the dorsal fin like a pennant, and a dark band links the eyes across the head.23
Personality what they are like
Peaceful and sociable. In the wild it gathers in large schools above the reef.312
Daily activity how busy a day looks
A mid-water swimmer that needs open swimming room, as wild fish feed on plankton in open water.12
Grooming and care the hands-on bits
Rated easy care. Several can be kept together if they are added at the same time. Generally safe in a reef tank when well fed, but watch it around corals.3
Home where they are happiest
A tank of at least 125 US gallons (about 475 L). Saltwater at 22 to 26 °C (72 to 78 °F), pH 8.1 to 8.4, specific gravity 1.020 to 1.025. Wild fish favour outer reef slopes and current channels, mostly at 5 to 30 m.312
Food basics what goes in the bowl
A plankton eater. Wild fish pick zooplankton from the water column, so offer small meaty marine foods such as mysis and similar frozen preparations.123
Company who they like around
A schooling species that does well in a group. Adults form pairs when breeding.123
The story where it all began
David Starr Jordan described the species in 1903. In the aquarium trade it is often sold as a lower-cost look-alike of the Moorish idol.12
Fun facts for the dinner table
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed 2009)1
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Heniochus Butterflyfish. It is our own starting plan, not a vet's advice, and you can change every line in the app.
- 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 Heniochus Butterflyfish?
Feed small amounts once or twice a day. Furry Diary's starting plan suggests daily feedings, and it's best to offer just enough that your fish eats in a couple of minutes.312 Furry Diary plan
What does a Heniochus Butterflyfish eat, and what should it never eat?
This fish eats small meaty marine foods like mysis and similar frozen preparations, as it is a plankton eater in the wild. It should never be given large or non-marine foods; always check with your vet or a good breeder for a safe diet.312
How much space does a Heniochus Butterflyfish need?
A tank of at least 125 US gallons (about 475 L) is recommended. This gives the fish open swimming room, as it is a mid-water swimmer that needs space to move.312
What temperature, light or water does a Heniochus Butterflyfish need?
Keep saltwater at 22 to 26 °C (72 to 78 °F), with a pH of 8.1 to 8.4 and specific gravity of 1.020 to 1.025. Furry Diary's plan includes daily temperature checks and weekly salinity checks.312 Furry Diary plan
How often should I clean a Heniochus Butterflyfish's home?
Furry Diary's plan suggests cleaning the glass weekly and doing a 10 to 20% water change every two weeks. Also top up evaporation daily with fresh RO water, not salt water. Furry Diary plan
Can a Heniochus Butterflyfish live with others?
Yes, it is a peaceful and sociable schooling species that does well in a group. Several can be kept together if added at the same time, and it is generally safe in a reef tank when well fed, though watch it around corals.312
How long does a Heniochus Butterflyfish live?
Lifespan varies depending on care and environment. For specific information, ask your vet or a good breeder, as this is not covered in the provided facts.
Can I handle a Heniochus Butterflyfish?
It is best not to handle this fish, as it is a delicate marine species. Handling can cause stress or injury, so always use a container or net if needed, and ask your vet for advice.312
Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Furry Diary's own starting care plan. A friendly guide, not a vet's advice.
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Where this comes from
Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at support@furrydiary.app and we will fix it.
- FishBase: Heniochus diphreutes, False moorish idol fishbase.seused for distribution, length, depth, habitat, diet, cleaning behaviour, IUCN status, describer
- Wikipedia: Heniochus diphreutes en.wikipedia.orgused for colour description, length, schooling, cleaning, aquarium trade note
- LiveAquaria: Schooling Bannerfish liveaquaria.comused for aquarium care, tank size, water parameters, temperament, diet, colours
- VCA Animal Hospitals: Feeding times and frequency for your dog vcahospitals.comused for owner questions
- ASPCA: Dog grooming tips aspca.orgused for owner questions
- ASPCA: Cat grooming tips aspca.orgused for owner questions
- ASPCA: People foods to avoid feeding your pets aspca.orgused for owner questions
- RSPCA: What to feed your rabbit rspca.org.ukused for owner questions
Checked 2026-09-30. Text is written in our own words from these sources.