Species profile
Serpae Tetra
Megalamphodus eques
Semi aggressive
Easy care
90 L minimum aquarium
3.5–4 cm adult size
Midwater
Minimum group: 10
About this species
General notes for hobby use.
Robust shoaling tetra with a real fin-nipping tendency. A large group and adequate swimming room reduce, but do not eliminate, compatibility issues.
Water parameters
Suggested general range for long-term care.
Temperature
22–26 °C
pH
6–7.5
GH
Up to 18 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
Midwater
Territory level
Low
Predation risk
Tiny fry
Bioload factor
0.65
Keep at least ten and avoid slow, long-finned tankmates. Intra-group chasing and fin biting can intensify in cramped groups or around food.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
Yes / caution
Plant safe
Yes
Shrimp safe
No / caution
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
90 L
Minimum footprint
80 × 35 cm
Accepted scientific name
Megalamphodus eques
Alternative names
Serpae Tetra, Jewel Tetra, Hyphessobrycon eques, Hyphessobrycon serpae, Hyphessobrycon callistus
Native range
Central South America, including Paraguay and Paraná-associated basins.
Natural habitat
Often found in slow or stagnant vegetated waters, especially among emergent plant stems.
Diet & feeding
Feeds on worms, crustaceans, insects and some plant material; accepts varied prepared and frozen foods.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Females are generally fuller-bodied; males can be slimmer and more intensely coloured.
Breeding
Non-guarding egg scatterer; eggs are deposited among plants and adults may eat them.