Species profile
Splash Tetra
Copella arnoldi
Peaceful
Moderate care
80 L minimum aquarium
4–5.5 cm adult size
Top
Minimum group: 8
About this species
General notes for hobby use.
Surface-oriented shoaler famous for laying eggs above the waterline. A completely covered aquarium is mandatory.
Water parameters
Suggested general range for long-term care.
Temperature
23–28 °C
pH
5–7.5
GH
1–12 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: 8
Tank zone
Top
Territory level
Low
Predation risk
Tiny fry
Bioload factor
0.5
Peaceful and social; males display near spawning sites. Keep with calm species that do not dominate the surface.
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
80 L
Minimum footprint
80 × 30 cm
Accepted scientific name
Copella arnoldi
Alternative names
Splash Tetra, Splashing Tetra
Native range
Lower Amazon and Guiana Shield drainages of northern South America.
Natural habitat
Shallow, vegetated forest waters. Leave humid covered airspace and suitable leaves or cover near/above the surface.
Diet & feeding
Surface insects and small invertebrates plus floating micro-pellets/flakes.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Males are larger, more colourful and develop longer fins; females are smaller and fuller.
Breeding
Pair leap together to place eggs on leaves/glass above water; the male repeatedly splashes the clutch to keep it moist until hatching.