Not furry, but we like them anyway.
Flame Tetra
Hyphessobrycon flammeus
Also called Red tetra, Rio tetra, Von Rio tetra, Fire tetra
From South America: coastal south-eastern Brazil in Rio de Janeiro and São Paulo states (Guanabara Bay tributaries, middle Paraíba do Sul, Guandu and upper Tietê basins)123
At a glance the quick version
Looks how to spot one
Small, deep-bodied scaled characin
A tiny tetra that glows red toward the rear. The front half is silvery with two dark vertical bars behind the gill cover, and most fins are washed in red. Males are slimmer and brighter, with dark tips on the anal and pelvic fins.31
Personality what they are like
Gentle and sociable. Within a group the leading males have small, harmless contests, which adds interest without bothering other fish.12
Daily activity how busy a day looks
An active shoaling swimmer that likes open water in front of planted areas.13
Grooming and care the hands-on bits
Easy to keep with steady water quality and routine partial water changes. Colours are strongest in a well-planted tank with a varied diet.1
Home where they are happiest
Tank with a base of at least about 60 x 30 cm (around 54 litres). Temperature about 20 to 28 °C, pH about 5.5 to 7.8, water from soft to fairly hard (1 to 25 dGH across sources). In the wild it lives in small, slow, shaded streams with clear or brown water.12
Food basics what goes in the bowl
Omnivore. Natural food includes small insects, worms, tiny crustaceans, algae and plant matter. In the aquarium give quality dried food plus small live or frozen foods such as bloodworm, mosquito larvae and Daphnia.12
Company who they like around
Keep at least 5, ideally 8 to 10 or more, with other small peaceful fish such as small tetras and catfish.12
The story where it all began
Flame tetras arrived in the aquarium hobby in 1920 through C. Bruening of Hamburg, a few years before George S. Myers described the species in 1924. It has been bred commercially for so long that wild fish are no longer collected for the trade.31
Fun facts for the dinner table
- 1
It was kept by aquarists for about four years before scientists formally described it in 1924.3
- 2
The fish in shops are captive-bred, and breeders have created orange, golden, diamond and albino strains.1
- 3
A female can lay roughly 200 to 330 eggs, which hatch in 2 to 3 days.2
- 4
Its homeland includes the streams around the city of Rio de Janeiro, which is where the nickname 'Rio tetra' comes from.3
Recognised by the official bits
- IUCN Red List
- Endangered in the wild (assessed 7 November 2018); widely captive-bred for the aquarium trade2
- Brazilian national list of threatened fish
- Included since 20041
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Flame Tetra. 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
- Water changeAbout 25% of the waterevery week
- Water testevery week
- Glass cleanevery week
- Filter rinseRinse in old tank water, never tap waterevery month
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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.
- Seriously Fish: Hyphessobrycon flammeus seriouslyfish.comused for range, size, care parameters, diet, behaviour, colour strains, conservation listing
- FishBase: Hyphessobrycon flammeus fishbase.seused for distribution, length, water parameters, IUCN status, lifespan, breeding
- Wikipedia: Flame tetra en.wikipedia.orgused for appearance, history, other names
Checked 2026-09-30. Text is written in our own words from these sources.