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Species profile

Schwartz’s Corydoras

Hoplisoma schwartzi

Common names: Schwartz’s Corydoras, Schwartz's Cory, Schwartzi Corydoras

Recognized speciesCorydoras
Schwartz’s Corydoras (Hoplisoma schwartzi)

Adult size

Up to 6 cm

Typical adult length 4.5–6 cm.

Up to 6 cm

Countries of origin

  • See all stock from Brazil

Good fit for your tank?

Good fit for

  • A mature peaceful community with soft sand
  • A keeper able to maintain a sizeable same-species group
  • An aquarist wanting a bold striped cory without aggressive behaviour

Think carefully if

  • The substrate is sharp or traps large amounts of waste
  • You want a cory that breeds very easily
  • The aquarium contains aggressive bottom fish

Schwartz’s Corydoras is a peaceful South American callichthyid catfish recognised by several dark longitudinal stripes across a pale body and a tall patterned dorsal fin. It should be kept in a same-species group over fine sand in clean, oxygen-rich freshwater.

Appearance and Identification

Schwartz’s Corydoras has a pale silver body with rows of dark spots that form broken horizontal lines, plus a dark band through the eye. The dorsal fin is tall and may show an extended leading ray in mature specimens.

Identify this profile by the combination of several dark longitudinal stripes across a pale body and a tall patterned dorsal fin. Older sources commonly list this fish as Corydoras schwartzi; the current profile follows the accepted or revised placement Hoplisoma schwartzi. Colour alone can be unreliable in stressed, juvenile, or poorly conditioned fish, so body shape, snout length, fin pattern, and provenance should also be checked.

Mature females are generally larger and fuller-bodied when viewed from above. Males remain slimmer and may show more pointed fins, but pattern and dorsal-fin height vary too much to sex every fish reliably.

Tank Requirements

Suggested filter
About 300–380 litres an hour
Suggested heater
About 75–125 W for this tank
Minimum tank volume
75 litres
Minimum tank length
75 cm
Minimum group size
6
Recommended group size
8
Activity level
Moderate
Flow preference
Moderate
Planting preference
Moderately planted
Hiding places
Yes
Lid recommended
Yes
Jumping risk
Low

Use fine sand, shaded retreats beneath wood or plants and open floor space for a group. Clean substrate and regular water changes are important because this species can suffer barbel damage when kept over dirty or abrasive material.

Behaviour and Tankmates

This is a peaceful shoaling cory that is often reserved when first introduced. A proper group and calm midwater fish usually encourage more confident daytime foraging.

Keep at least 6 of the same species or coded population, with 8 or more preferred where space permits. A mixed collection of single corys does not fully replace a proper same-species group.

It is not territorial. Males may briefly chase one another or follow females during courtship, but sustained aggression is unusual when the group has adequate floor space.

It works well with peaceful tetras, rasboras, pencilfish and other calm community species. Avoid aggressive cichlids, fin-nippers and territorial bottom dwellers.

Check tankmates for this species

Water Parameters

Temperature
22–27 °C
pH
4.8–7
GH
0–8
KH
0–4
TDS
20–150
Stability importance
Critical

Soft, mildly acidic water best reflects the natural habitat and usually gives the most reliable breeding results. Stable clean water is more important than forcing an exact pH.

Parameter caveat
Acclimate slowly to changes in temperature, pH, and conductivity. Corydoradine catfish periodically gulp atmospheric air, so the water surface must remain accessible. Warm water holds less oxygen and requires stronger aeration.

Feeding

Diet types
Insectivore, Omnivore, Scavenger
Feeding frequency
Daily
Preferred foods
  • Quality sinking catfish pelletUse a small sinking pellet or wafer as a staple. Feed enough for every fish to reach food after faster midwater fish have eaten.
  • Frozen or live daphnia and cyclopsSmall crustacean prey supports natural foraging and is useful for conditioning breeding groups.
  • Frozen bloodworm, black mosquito larvae, or tubifexOffer clean, appropriately sized portions in rotation rather than as the only food.
  • Soft vegetable-based waferProvides dietary variety, although these catfish are not algae-eating cleanup animals and still require protein-rich food.

Feed quality sinking pellets, granules and tablets together with frozen or live invertebrate foods. Ensure food reaches the bottom and that every fish eats rather than relying on leftovers.

Feed after faster surface and midwater fish have taken their share, and confirm that every individual reaches food. Use small portions once or twice daily, remove persistent leftovers, and vary prepared and frozen or live foods.

Breeding

Breeding type
Egg Layer
Breeding difficulty
Difficult
Breeding temperature
24 °C
Breeding pH
6
Brood or egg count
Usually 40 to 150 adhesive eggs.
Incubation
4 days
Parental care
None
Baby foods
  • Newly hatched brine shrimpA primary growth food after fry have absorbed the yolk sac; feed small rinsed portions several times daily.
  • MicrowormsUseful for newly feeding fry that remain close to the substrate.
  • Vinegar eels or cultured infusoriaHelpful for the smallest species and uneven broods during the first feeding stage.
  • Fine powdered fry foodUse sparingly as a supplement and siphon uneaten material to protect water quality.

Captive breeding is documented but can be less predictable than with common bronze or peppered corys. Adults use the typical cory spawning sequence and attach eggs to surfaces; the eggs can be fungus-prone and should be kept clean and well oxygenated.

Habitat and Origin

Geographic origin
Amazon Basin, Brazil, South America
Natural habitat
Freshwater River, Freshwater Stream, Sand/Mud Substrate
Aquarium contexts
Breeding Aquarium, Freshwater Aquarium, Freshwater Community, Planted Aquarium
Audience level
Advanced

Classification

Profile type
Recognized species
Genus
Hoplisoma
Family
Callichthyidae
Species group
Corydoras, Fish
Previous scientific names
Corydoras schwartzi, Name supplied in older aquarium literature or trade usage. The current profile uses Hoplisoma schwartzi under the revised Corydoradinae classification.

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