Care guide · Freshwater · fish

Sterba's cory

Hoplisoma sterbai

Photo: Tino Strauss · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.

Sterba's cory, Hoplisoma sterbai, stands out through pale spots on a dark head and orange accents on the pectoral fins. This sociable bottom dweller searches for small food particles in a suitable group, alternating activity with shared resting periods. Compared with the panda cory, it is better suited to a somewhat warmer tropical aquarium. That does not make it an automatic addition to every warm tank: oxygenation, free floor space and accessible meals still matter. A large territorial companion can also severely restrict an otherwise peaceful group. Shops often retain the name Corydoras sterbai. Choosing this catfish means deliberately reserving space for several individuals and assessing the whole bottom layer. A filter's rated volume says little about the living space available.

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At a glance

Temperature: 24–28 °C
pH: 6.0–7.2
GH: 2–15 °dGH
Aquarium length: At least 80 cm
Adult size: Approximately 6.5 cm
Group size: At least 6 individuals
Swimming zone: Bottom
Temperament: Peaceful
Cover: Plants and sheltered areas
Staple food: Sinking tablet, small portions, Small granules
Supplementary food: Live food, Frozen food, Finely crumbled dried natural food

For a group of at least six, we choose eighty centimetres of length; one hundred centimetres provides more scope for a larger group and companions. Assess the floor space left after adding wood, rocks and plants. A carpet covering the entire bottom leaves little opportunity for characteristic foraging.

About this species

Standard length can reach approximately six and a half centimetres, excluding the tail fin. Adult females are often broader, particularly when viewed from above. Pale spots on a dark head distinguish it from Brochis haraldschultzi, which has dark markings on a paler head and a longer snout. An orange fin alone is not a conclusive identification feature.

The genus Hoplisoma follows the modern classification of cory catfish; Corydoras sterbai remains a useful former search name. Albino cultivated forms lack the normal head pattern, so take extra care over identity and provenance. The tough body covering does not remove the need for gentle handling: fin spines can become caught in a net. Never force a trapped fish free.

Natural habitat

The species was described from the Guaporé region on the Brazil–Bolivia border. Small tributaries and sheltered lowland areas differ from an exposed, fast-flowing river channel. Foraging occurs mainly near the bottom, where shade, shelter and accessible substrate work together.

The aquarium does not need to be stained deep brown. Use roots for shade and open sand patches for searching. Leaves may form part of the layout, but a thick layer of rotting material is not automatically more natural or healthier. Marginal planting provides practical cover. Present these plants as aquarium choices without suggesting that every recommended plant grows at the same wild locality.

Aquarium and layout

Use fine rounded sand in feeding areas and keep structures stable. Provide circulation and gas exchange without turning every resting place into a powerful jet. Clean beneath overhanging wood, where both fish and food remnants gather. Leave a route to the surface for occasional air gulping. A large enough filter cannot compensate for inadequate floor space or a lack of peace between occupants.

Water conditions

The maintenance range is 24–28 °C, pH 6–7.2 and GH 2–15. Within this range, Sterba's cory can be kept warmer than a panda, but the upper limit is not a compulsory target. Choose conditions suitable for the other inhabitants as well.

Warm water and heavy stocking call for additional attention to oxygen and organic waste. Check filter flow, surface movement and water readings when several fish breathe abnormally. A quick trip upwards can be normal; frequent agitation across the group is different. Make water changes support stable quality, using prepared water suited to the aquarium. Repeated feeding in an inaccessible corner can create local waste accumulation while the rest of the tank looks well maintained.

Behaviour and group size

A group of six or more of its own species is the starting point. Sterba's corys do not always move in tight formation, but seek each other out and respond to companions' activity. A lone individual among other species loses those opportunities. They are generally peaceful and can share with calm fish in other layers.

Assess dwarf cichlids especially during brood care: both use the bottom, so a guarded clutch can sharply reduce available territory. Larger fish also pose a risk if a young cory fits in their mouth; the spines make such an incident dangerous to both animals. Consider stress and defensive secretions during transport. Ask the shop to package them separately as appropriate and avoid unnecessary catching. Normal coexistence differs from confinement in a small amount of transport water.

Feeding

This catfish needs its own complete bottom-feeding diet, not a job as a cleaner. Choose sinking tablets or small granules accessible on the substrate. Animal ingredients fit its search for small invertebrates; an exclusively algae-food diet is not a sensible default.

Vary meals with suitable small frozen or live foods. Spread food so the largest fish does not monopolise the same tablet. In a busy community, targeted feeding under dimmed lighting may help, provided you can check that the corys eat. Remove persistent leftovers. Watch the belly outline and barbels during quiet observation; a healthy appetite across the group does not rule out a struggling individual.

Breeding

Captive breeding is possible with mature, well-conditioned fish. Males follow a ripe female, and the familiar T-position forms part of spawning. The female attaches adhesive eggs to surfaces including glass and plants. A separate setup makes it easier to protect eggs and fry from companions.

The parents do not guard the clutch. After separating eggs or adults, good hygiene, gentle circulation and safe sponge filtration matter. Once the yolk sac is used up, offer appropriately fine foods such as microworms or small Artemia nauplii and check actual feeding. Sources describe slightly cooler replacement water as a stimulus; this does not justify repeated extreme cold or major shocks. Healthy adults without a spawn are preferable to forced breeding that weakens the fish.