Species profile
Green Severum
Heros efasciatus
Semi aggressive
Moderate care
300 L minimum aquarium
15–25 cm adult size
Midwater
Can be kept singly
About this species
General notes for hobby use.
Large deep-bodied South American cichlid. Generally placid for its size outside spawning, but needs substantial swimming and turning room, robust filtration and secure decor.
Water parameters
Suggested general range for long-term care.
Temperature
23–29 °C
pH
6–7.5
GH
Up to 15 dGH
KH
Not yet documented
Flow preference
Low–moderate
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Can be kept singly
Tank zone
Midwater
Territory level
Moderate
Predation risk
Small fish
Bioload factor
3
Can live singly, in compatible pairs or in a properly sized group. Pair formation and spawning can trigger strong territoriality. Fish small enough to swallow are at risk and soft plants are commonly eaten.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Caution
Shrimp safe
No / caution
Snail safe
Yes
Cave breeder
No
Digs substrate
Yes
Jump risk
Yes
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
Not yet documented
Diet type
Omnivore
Minimum aquarium volume
300 L
Minimum footprint
150 × 50 cm
Accepted scientific name
Heros efasciatus
Alternative names
Severum, Green Severum Cichlid, Heros appendiculatus
Native range
Amazon basin in Brazil, Ecuador, Colombia, Bolivia and Peru.
Natural habitat
Favors slow water with submerged wood, roots and debris. Use driftwood, shaded cover and open swimming space with gentle-to-moderate circulation.
Diet & feeding
Omnivorous with significant plant/fruit intake. Use complete cichlid pellets plus vegetables and varied frozen invertebrate foods; expect soft plants to be sampled.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Mature males usually show stronger patterned cheek markings and more developed dorsal/anal fins; external sexing is not infallible.
Breeding
Biparental substrate spawner. Pairs clean a hard surface and may lay hundreds of eggs; both parents guard eggs and herd fry.