Not furry, but we like them anyway.
Sterbai Corydoras
Hoplisoma sterbai (Knaack, 1962); long known as Corydoras sterbai
Also called Sterba's cory, Sterbai cory, Corydoras sterbai (former name)
From The Rio Guaporé region on the border of Bolivia and Brazil, in small tributaries, creeks, pools and flooded forest. Most aquarium fish are farm-bred in Eastern Europe and Asia.123
At a glance the quick version
Standard length; Wikipedia 5.1 to 6.6 cm, Seriously Fish 6.5 cm, FishBase 6.8 cm.
Looks how to spot one
Armoured catfish (bony plates, no scales)
A sturdy little armoured catfish with a dark head covered in small white spots and a body patterned with pale spots on a darker background. Albino and darker forms are also bred. Females are rounder and broader than males.12
Personality what they are like
Calm, friendly and highly social. A group spends the day sifting the sand together and gets bolder and more active the more of their own kind they have.12
Daily activity how busy a day looks
Active bottom foragers that clean up leftover food rather than algae. Like other corys they rise to gulp air at the surface now and then, so leave the surface open.243
Grooming and care the hands-on bits
Water: 24 to 28 C per Seriously Fish (FishBase gives 21 to 25 C), pH 6.0 to 7.6, hardness 1 to 15 dGH. Tank-bred fish adapt to a wide range, but clean water with regular partial changes and low nitrate suits them best.132
Home where they are happiest
A tank of at least 45 x 30 x 30 cm (about 41 litres) for a small group, with soft sand, some plants or wood for cover and open floor space to forage.1
Food basics what goes in the bowl
Omnivorous and easy to feed: a quality sinking pellet or tablet as the staple, plus live or frozen daphnia, brine shrimp, bloodworm and similar treats.1
Company who they like around
Keep at least five or six together; they are shy alone and confident in a group. They suit other peaceful community fish.12
The story where it all began
Knaack described the fish in 1962 and named it after Günther Sterba, a Leipzig zoology professor known for his widely read aquarium handbooks. Wild fish come from the Guaporé region, but today nearly all aquarium stock is commercially bred.21
Fun facts for the dinner table
- 1
It is named after Günther Sterba, an ichthyologist whose aquarium books influenced generations of fishkeepers.2
- 2
Unlike many corys it is comfortable in warmer water, up to about 28 C.1
- 3
Its white-spotted dark head is the easiest way to tell it apart from the look-alike Corydoras haraldschultzi.1
- 4
It is a facultative air-breather that can take gulps of air at the surface.3
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed 15 October 2020)3
- Taxonomy
- Described by Knaack in 1962; now placed in the resurrected genus Hoplisoma after a 2025 phylogenomic study5
- Family
- Callichthyidae (armoured catfishes)4
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Sterbai Corydoras. 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: Corydoras sterbai seriouslyfish.comused for size, care, behaviour, diet, colour
- Wikipedia: Corydoras sterbai en.wikipedia.orgused for etymology, history, colours, behaviour
- FishBase: Hoplisoma sterbai fishbase.seused for valid name, size, range, environment, IUCN status
- Wikipedia: Corydoras en.wikipedia.orgused for air breathing, family
- Wikipedia: Hoplisoma en.wikipedia.orgused for genus change
Checked 2026-09-30. Text is written in our own words from these sources.