Species profile
Swordtail
Xiphophorus hellerii
Peaceful
Easy care
120 L minimum aquarium
8–14 cm adult size
Top mid
Minimum group: 4
About this species
General notes for hobby use.
Large, active livebearer that needs much more swimming length than a platy or guppy. Cooler, well-oxygenated hard water suits the species well.
Water parameters
Suggested general range for long-term care.
Temperature
15–28 °C
pH
7–8
GH
8–20 dGH
KH
Not yet documented
Flow preference
Moderate–high
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 4
Tank zone
Top mid
Territory level
Low
Predation risk
Fry
Bioload factor
1.2
Males can compete strongly. In smaller setups keep one male with several females; larger groups need enough males and females to diffuse rivalry. Use a tight lid.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
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
120 L
Minimum footprint
90 × 35 cm
Accepted scientific name
Xiphophorus hellerii
Alternative names
Green Swordtail
Native range
Atlantic-slope Central American drainages, principally Mexico through Guatemala and adjoining regions.
Natural habitat
Occurs in rivers, streams and other flowing waters. Open swimming space, plants along the margins and good oxygenation are appropriate.
Diet & feeding
Feed quality omnivore/livebearer foods with plant matter and small frozen/live foods.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Males possess a gonopodium and the characteristic elongated lower caudal-fin sword; females lack the sword and are usually larger-bodied.
Breeding
Livebearer. Gestation is roughly four weeks and females can produce substantial broods; adults may eat fry.