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Species profile

Rikbaktsa Corydoras

Hoplisoma rikbaktsa

Common names: Rikbaktsa Corydoras, Rikbaktsa Cory, Rikbaktsa Catfish

Recognized speciesCorydoras
Rikbaktsa Corydoras (Hoplisoma rikbaktsa)

Adult size

Up to 5 cm

Typical adult length 3.5–5 cm.

Up to 5 cm

Countries of origin

  • See all stock from Brazil

Good fit for your tank?

Good fit for

  • An experienced keeper maintaining uncommon Corydoradinae
  • A quiet species-focused aquarium with excellent oxygenation
  • An aquarist willing to document breeding observations

Think carefully if

  • You need a well-established beginner care profile
  • The fish's identity or origin is uncertain
  • You cannot provide quarantine and close feeding observation

Rikbaktsa Corydoras is a peaceful South American callichthyid catfish recognised by a compact pale body patterned with a dark mask and distinct flank blotches or spots. It should be kept in a same-species group over fine sand in clean, oxygen-rich freshwater.

Appearance and Identification

This uncommon cory has a pale body with a broad dark mask through the eye. A thin mid-body stripe may be present or broken into a small series of dark blotches, creating noticeable variation between individuals.

Identify this profile by the combination of a compact pale body patterned with a dark mask and distinct flank blotches or spots. Older sources commonly list this fish as Corydoras rikbaktsa; the current profile follows the accepted or revised placement Hoplisoma rikbaktsa. 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 males develop numerous visible odontodes on the cheeks, sides of the head, pectoral girdle and pectoral spines. Females have far fewer and smaller odontodes, making this one of the more clearly dimorphic short-snouted corys.

Tank Requirements

Suggested filter
About 240–300 litres an hour
Suggested heater
About 50–100 W for this tank
Minimum tank volume
60 litres
Minimum tank length
60 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 a mature aquarium with fine sand, excellent water quality, strong oxygenation and a mixture of sheltered and open foraging areas. Its natural association with clear, flowing water supports avoiding stagnant conditions and abrupt changes.

Behaviour and Tankmates

Available aquarium observations indicate a peaceful, social bottom fish that should be maintained in a group. Because the species is still uncommon, keepers should monitor feeding, shyness and group interactions closely rather than assuming every detail matches common corys.

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.

Choose calm, non-aggressive companions with similar environmental needs. Avoid large predators, forceful bottom dwellers and mixed collections where uncertain identification or accidental hybridisation could become concerns.

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.

Offer varied small sinking pellets, tablets and live or frozen invertebrate foods. Confirm that every specimen feeds after purchase, especially when dealing with recently imported or stressed fish.

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 30 to 100 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 reproduction is documented, but detailed and repeatable breeding guidance remains limited. Treat it as a specialist project, maintain a mature group in excellent condition and protect any eggs or fry that appear.

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 rikbaktsa, Name supplied in older aquarium literature or trade usage. The current profile uses Hoplisoma rikbaktsa under the revised Corydoradinae classification.

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