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Species profile

Skunk Corydoras

Hoplisoma granti

Common names: Skunk Corydoras, Grant's Corydoras, Skunk Cory

Recognized speciesCorydoras
Skunk Corydoras (Hoplisoma granti)

Adult size

Up to 5.5 cm

Typical adult length 4–5.5 cm.

Up to 5.5 cm

Countries of origin

  • See all stock from Brazil
  • See all stock from Colombia
  • See all stock from Ecuador
  • See all stock from Peru

Good fit for your tank?

Good fit for

  • A peaceful community with fine sand and shaded cover
  • A keeper able to maintain a proper same-species group
  • An aquarist interested in accurately identified cory species

Think carefully if

  • The fish is being sold under the old arcuatus identification
  • Tank mates are aggressive or dominate feeding
  • The aquarium lacks clean, oxygenated bottom habitat

Skunk Corydoras is a peaceful South American callichthyid catfish recognised by a bold arched black stripe running from the head along the back toward the caudal peduncle. It should be kept in a same-species group over fine sand in clean, oxygen-rich freshwater.

Appearance and Identification

The Skunk Cory has a pale grey, cream or greenish body crossed by a broad dark stripe that arches from the snout over the back toward the tail. The clean curved stripe is its main identifying feature.

Identify this profile by the combination of a bold arched black stripe running from the head along the back toward the caudal peduncle. Older sources commonly list this fish as Corydoras granti; the current profile follows the accepted or revised placement Hoplisoma granti. 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 become broader and fuller-bodied when viewed from above, while males remain slimmer and may have more pointed fins. The black stripe itself does not reliably indicate sex.

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

Provide fine sand, shaded cover from wood or plants, open foraging space and well-oxygenated water. Stable conditions and regular maintenance are important, particularly for wild-caught specimens.

Behaviour and Tankmates

This is a peaceful, social cory that may be shy in small groups. With sufficient companions and calm dither fish, it becomes a more visible and active bottom forager.

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.

Keep it with peaceful small or medium community fish that do not harass it or monopolise sinking food. Avoid aggressive cichlids, territorial catfish and large predators.

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 sinking pellets, tablets and granules together with varied frozen or live invertebrate foods. Feed deliberately and ensure all members of the group receive food.

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 possible but not as routine as with the common farmed corys. Well-conditioned adults use the typical cory spawning sequence and attach eggs to selected surfaces, after which the eggs require protection from the adults.

Habitat and Origin

Geographic origin
Amazon Basin, Brazil, Colombia, Ecuador, Peru, 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 granti, Name supplied in older aquarium literature or trade usage. The current profile uses Hoplisoma granti under the revised Corydoradinae classification., Corydoras arcuatus (aquarium trade misidentification), The common aquarium Skunk Cory was long confused with the true Brochis arcuatus. The fish represented here is Hoplisoma granti.

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