Species profile
Glowlight Tetra
Hemigrammus erythrozonus
Peaceful
Easy care
54 L minimum aquarium
3–4 cm adult size
Mid lower
Minimum group: 8
About this species
General notes for hobby use.
Small peaceful blackwater tetra that benefits from a proper shoal, subdued lighting and planted/shaded cover.
Water parameters
Suggested general range for long-term care.
Temperature
24–28 °C
pH
5.5–7.5
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
Mid lower
Territory level
None
Predation risk
Tiny fry
Bioload factor
0.55
Gentle and sometimes shy; avoid large, aggressive or hyperactive tankmates.
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
54 L
Minimum footprint
60 × 30 cm
Accepted scientific name
Hemigrammus erythrozonus
Alternative names
Glowlight Tetra
Native range
Guyana, principally the Essequibo River system.
Natural habitat
Forest streams and blackwater tributaries with tannins, leaf litter, roots and subdued light.
Diet & feeding
Feeds on small invertebrates and accepts fine prepared foods, frozen daphnia and similar fare.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Females are usually deeper-bodied and fuller, especially when gravid.
Breeding
Egg scatterer in soft acidic water; adults provide no care and may eat spawn.