Species profile
Blue Axelrodi Rasbora
Sundadanio cf. axelrodi "Blue"
Peaceful
Hard care
40 L minimum aquarium
1.5–2.3 cm adult size
Top mid
Minimum group: 12
About this species
General notes for hobby use.
Blue Sundadanio aquarium trade group. Keep as a large shoal in very soft, acidic, calm blackwater-style conditions. Do not claim species-level identity from colour alone.
Water parameters
Suggested general range for long-term care.
Temperature
23–26 °C
pH
4–6.5
GH
0–5 dGH
KH
Not yet documented
Flow preference
Low
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 12
Tank zone
Top mid
Territory level
None
Predation risk
Tiny fry
Bioload factor
0.25
Tiny, peaceful blackwater shoaler that should not be mixed with large or boisterous 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
40 L
Minimum footprint
45 × 25 cm
Alternative names
Blue Axelrodi Rasbora, Axelrod's Rasbora, Sundadanio axelrodi, Sundadanio gargula, Rasbora sp. aff. axelrodi Blue
Native range
Sundaland trade complex. Blue forms include true S. axelrodi from Bintan and S. gargula from Bangka; exact origin matters for species-level identification.
Natural habitat
Very soft, acidic peat-swamp/blackwater conditions with leaf litter, wood, subdued light and negligible to gentle flow.
Diet & feeding
Tiny live/frozen microfoods and suitably fine dry foods.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Males tend to be slimmer and more intensely coloured; females are fuller.
Breeding
Tiny egg-scatterer with no parental care; specialist soft-water breeding conditions are required.