Common name
Dwarf cory
Scientific name
Gastrodermus hastatus
Category
Freshwater fish
Group
Corydoras-type catfish
Environment
Freshwater
Origin
Paraguay and lower Paraná River basins in South America
Care level
Beginner
Adult size
3 cm
Expected lifespan
3–5 years
Minimum housing
Not applicable — rejected duplicate; use the canonical Hastatus corydoras profile
Temperature
22–27 °C
pH
6.0–7.6
Hardness / minerals
Soft to moderately hard
Salinity
Freshwater
Lighting
Normal aquarium lighting
Placement / swimming zone
Mid and bottom water

Identity and search names

Rejected duplicate route for Gastrodermus hastatus; the canonical permanent care profile is /species/hastatus-corydoras/. Permanent AquaNexus ID 245, slug dwarf-cory and public route /species/dwarf-cory/ are preserved.

Search names: Corydoras hastatus, Tail-spot cory, Dwarf cory

Canonical profile: Hastatus corydoras

Environment and housing

Smooth sand or fine rounded substrate, oxygenated water and shaded resting areas.

Water stability: Maintain 22–27 °C; pH 6.0–7.6; minerals: Soft to moderately hard; salinity: Freshwater. Stability, oxygen and nitrogen-cycle control matter more than chasing one exact reading.

Feeding and nutrition

Feeding ecology: Omnivore; must receive sinking food

Feeding routine: Do not use this duplicate route as a feeding approval. Follow the canonical Hastatus corydoras profile.

Social structure and compatibility

10+ in a calm tank

Not applicable as a separate approval; use the canonical Hastatus corydoras profile. Retain a cycled separation option for aggression, feeding exclusion, predation or disease.

Adult load and life support

Projected adult load: Not applicable. This is a rejected duplicate and does not establish a second stocking allowance.

Filtration: No second filtration standard is authorised here; use the canonical Hastatus corydoras profile.

Aeration: No second aeration standard is authorised here; use the canonical profile.

Maintenance: Maintain the canonical profile only; this duplicate route must not become a competing maintenance sheet.

Breeding and reproduction

Not applicable as a separate approval; use the canonical profile. Do not compromise adult welfare, genetic integrity, quarantine capacity or lawful rehoming to attempt breeding.

Quarantine, welfare and risk

Quarantine: Quarantine new fish in a separate fully cycled system for at least 30 days at the intended temperature and mineral chemistry. Use dedicated equipment; observe appetite, respiration, faeces, skin, fins, gills and behaviour; never add transport water to the display.

Welfare checks: Duplicate routes create contradictory care and medication risk. This permanent route is retained only for identity, alias and redirect-style guidance. Track individual body condition, feeding access, respiration, injury, abnormal hiding or aggression and use of the intended swimming zone.

Non-overridable warning

Rejected duplicate. Do not maintain a second care standard for Gastrodermus hastatus; use the canonical Hastatus corydoras profile at /species/hastatus-corydoras/.

Main risk: Duplicate advice diverging from the canonical Gastrodermus hastatus profile.

Australian biosecurity and release

Never release fish, aquarium water, sediment, plants, live food or wet equipment into drains, dams or natural waterways. Australian import eligibility is species-specific: check the current Live Import List, permitted ornamental-fish list and BICON conditions by accepted scientific name. Import requires a permit, an approved source country and approved-arrangement isolation. Check current South Australian noxious-fish and movement rules before purchase, sale, transport or disposal.

Current check: Current lawful import or possession must be checked by accepted scientific name. Absence from one state list is not import approval.

System demands

Filtration: Use mature biological filtration sized for the adult stock and feeding load, with guarded intakes and a flow pattern the species can use without continual effort.

Aeration: Maintain strong gas exchange and stable dissolved oxygen, especially overnight, during warm weather, medication, crowding or any interruption to filtration.

Maintenance: Test ammonia and nitrite after changes or abnormal behaviour; remove waste from the occupied zone and perform regular water changes matched to temperature and mineral chemistry.

Detailed husbandry

Identity Scope
Rejected duplicate route for Gastrodermus hastatus; the canonical permanent care profile is /species/hastatus-corydoras/. Permanent AquaNexus ID 245, slug dwarf-cory and public route /species/dwarf-cory/ are preserved.
Adult Size And Space
No separate housing approval is provided on this rejected duplicate route.
Social Structure
10+ in a calm tank
Swimming Zone
Primary zone: Mid and bottom water. Keep that zone open enough for normal movement, feeding, refuge and escape.
Feeding Ecology
Omnivore; must receive sinking food
Feeding Plan
Do not use this duplicate route as a feeding approval. Follow the canonical Hastatus corydoras profile.
Water Stability
Maintain 22–27 °C; pH 6.0–7.6; minerals: Soft to moderately hard; salinity: Freshwater. Stability, oxygen and nitrogen-cycle control matter more than chasing one exact reading.
Adult Projected Load
Not applicable. This is a rejected duplicate and does not establish a second stocking allowance.
Filtration
No second filtration standard is authorised here; use the canonical Hastatus corydoras profile.
Aeration
No second aeration standard is authorised here; use the canonical profile.
Maintenance
Maintain the canonical profile only; this duplicate route must not become a competing maintenance sheet.
Habitat Structure
Smooth sand or fine rounded substrate, oxygenated water and shaded resting areas.
Compatibility Plan
Not applicable as a separate approval; use the canonical Hastatus corydoras profile. Retain a cycled separation option for aggression, feeding exclusion, predation or disease.
Breeding Plan
Not applicable as a separate approval; use the canonical profile. Do not compromise adult welfare, genetic integrity, quarantine capacity or lawful rehoming to attempt breeding.
Quarantine
Quarantine new fish in a separate fully cycled system for at least 30 days at the intended temperature and mineral chemistry. Use dedicated equipment; observe appetite, respiration, faeces, skin, fins, gills and behaviour; never add transport water to the display.
Welfare Checks
Duplicate routes create contradictory care and medication risk. This permanent route is retained only for identity, alias and redirect-style guidance. Track individual body condition, feeding access, respiration, injury, abnormal hiding or aggression and use of the intended swimming zone.
Biosecurity And Release
Never release fish, aquarium water, sediment, plants, live food or wet equipment into drains, dams or natural waterways. Australian import eligibility is species-specific: check the current Live Import List, permitted ornamental-fish list and BICON conditions by accepted scientific name. Import requires a permit, an approved source country and approved-arrangement isolation. Check current South Australian noxious-fish and movement rules before purchase, sale, transport or disposal.
Main Risk
Duplicate advice diverging from the canonical Gastrodermus hastatus profile.
Overridable Warnings
Rejected duplicate. Do not maintain a second care standard for Gastrodermus hastatus; use the canonical Hastatus corydoras profile at /species/hastatus-corydoras/.

Sources

Source note

Current accepted identity, former names, adult scale, social structure, feeding ecology, adult projected load, filtration, aeration, maintenance, quarantine, welfare, Australian import controls and South Australian movement or no-release obligations were rechecked. AquaNexus wording is original.