Species profile
Red Phantom Tetra
Megalamphodus sweglesi
Peaceful
Moderate care
60 L minimum aquarium
3–4 cm adult size
Midwater
Minimum group: 8
About this species
General notes for hobby use.
Peaceful shoaling tetra with a distinctly cooler preferred temperature range than many common tropical tetras.
Water parameters
Suggested general range for long-term care.
Temperature
20–23 °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: 8
Tank zone
Midwater
Territory level
Low
Predation risk
Tiny fry
Bioload factor
0.55
Males display and spar harmlessly. Keep a good-sized shoal and do not force the species into permanently hot community temperatures.
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
60 L
Minimum footprint
60 × 30 cm
Accepted scientific name
Megalamphodus sweglesi
Alternative names
Red Phantom Tetra, Hyphessobrycon sweglesi
Native range
Upper Orinoco region of Colombia and Venezuela.
Natural habitat
Shaded forest streams and tributaries with vegetation and relatively cool tropical water.
Diet & feeding
Feeds on worms, small insects and crustaceans; accepts fine prepared foods and frozen/live supplements.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Males are usually slimmer and more strongly coloured; mature females become fuller-bodied.
Breeding
Non-guarding open-water/substrate egg scatterer with no parental care.