Species profile
Dwarf Corydoras
Gastrodermus hastatus
Peaceful
Easy care
45 L minimum aquarium
2.5–3.5 cm adult size
Bottom–mid
Minimum group: 10
About this species
General notes for hobby use.
Tiny social cory that regularly schools in midwater. A group of ten or more over fine sand is strongly preferred.
Water parameters
Suggested general range for long-term care.
Temperature
22–26 °C
pH
6–7.5
GH
Up to 15 dGH
KH
Not yet documented
Flow preference
Low–moderate
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 10
Tank zone
Bottom–mid
Territory level
None
Predation risk
None
Bioload factor
0.45
Very peaceful and easily intimidated by large or boisterous species. Works particularly well with other small calm fish.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Yes
Shrimp safe
Yes
Snail safe
Yes
Cave breeder
No
Digs substrate
No
Jump risk
Yes
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
Not yet documented
Diet type
Omnivore
Minimum aquarium volume
45 L
Minimum footprint
45 × 30 cm
Accepted scientific name
Gastrodermus hastatus
Alternative names
Dwarf Cory, Dwarf Corydoras, Corydoras hastatus, Tail-spot Pygmy Cory
Native range
Paraguay and Paraná river systems of central South America.
Natural habitat
Vegetated floodplain and slow-water habitats; fine substrate and dense cover suit natural foraging.
Diet & feeding
Micro-predatory omnivore; provide tiny sinking foods and small frozen/live invertebrates.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Females become larger and broader, particularly when viewed from above; males are slimmer.
Breeding
Typical cory-type adhesive egg placement on plants/glass following courtship.