Balloon Molly (Poecilia sphenops)

Family: Poeciliidae

A peaceful omnivore poeciliidae from Central America (from Mexico to Colombia) — beginner-friendly.

Care parameters

Water temperature
18–28 °C
pH
7.5–8.2
GH hardness
11–30 dGH
Adult length
5.2–7.5 cm
Minimum tank
75 L
Water layer
Upper; surface-oriented
Difficulty
Easy
Temperament
Peaceful
Origin
Central and North America

Species overview

Poecilia sphenops is a Poeciliidae from Central and North America. In the wild it prefers clear streams, rivers and still waters; in the aquarium it stays peaceful. Plan on 5.2–7.5 cm of adult fish at 18–28 °C. Related profiles: Poecilia reticulata, Poecilia latipinna, Poecilia wingei.

Native biotope

Habitat
Clear streams, rivers and still waters
Flow
Moderate flow
Dissolved O₂
Average oxygen needs

Aquascape & hardware

Substrate
Dark fine gravel or sand
Hardscape
Driftwood, water-worn stones and shelters that mimic the native biotope
Plants
Dense floating plants for cover and security

Temperament, diet & tankmates

Schooling
Solitary, pairs or small groups
Diet
Omnivore; quality prepared foods with variety
Recommended tankmates
  • Amur False Gudgeon — Similar size and water needs
  • China-Bitterling — Similar size and water needs
  • Acanthorhodeus chankaensis — Similar size and water needs
Avoid keeping with
  • Large aggressive cichlids — Bullying and injury risk
  • Known fin nippers — Constant stress and fin damage

Breeding & notes

Sexual dimorphism
Males are typically slimmer and more intensely colored; females fuller-bodied
Breeding method
Livebearer; females give birth to free-swimming fry; condition with rich foods and simulate seasonal changes

Frequently asked questions

Is Balloon Molly easy to keep?

Difficulty: easy. Peaceful. Solitary, pairs or small groups.

What temperature and water chemistry does Balloon Molly need?

Aim for 18–28 °C. Standard heater to hold the mid-range steadily; 18–28 °C recorded range.

How big does Balloon Molly get, and what tank size?

Adults reach 5.2–7.5 cm; it is upper; surface-oriented. Plan for at least 75 litres.

What does Balloon Molly eat?

Omnivore; quality prepared foods with variety. Feed two small meals a day rather than one large one.

Can Balloon Molly live with other fish?

Peaceful. Recommended tankmates: Amur False Gudgeon — Similar size and water needs, China-Bitterling — Similar size and water needs, Acanthorhodeus chankaensis — Similar size and water needs. Avoid Large aggressive cichlids — Bullying and injury risk, Known fin nippers — Constant stress and fin damage.

Where does Balloon Molly come from?

Native to Central and North America, where it lives in clear streams, rivers and still waters. Moderate flow; Average oxygen needs.

Does Balloon Molly jump?

Not a noted jumper — a standard cover still keeps dust and spray in.

How does Balloon Molly breed?

In the aquarium: livebearer; females give birth to free-swimming fry; condition with rich foods and simulate seasonal changes. Males are typically slimmer and more intensely colored; females fuller-bodied.