Care guide, husbandry, breeding, disease, and sourcing intelligence on Balloon Molly - written by the Fast Aquatics editorial team.
Balloon Molly at a glance
Adult size: 3 inches · Min tank/pond: 20 gallons · Difficulty: beginner · Diet: omnivore · Lifespan: 2-4 years.
Balloon Molly (Poecilia sphenops (var)) is a popular freshwater fish in the aquarium and pond hobby. Hardy and forgiving when given proper water chemistry.
Where Balloon Molly comes from
Balloon Molly (Poecilia sphenops (var)) is native to specific tropical and subtropical freshwater systems. Captive-bred specimens at most LFS come from generations of farmed stock and are generally hardier and more colorful than wild-caught equivalents.
Balloon Molly tank size and setup
Balloon Molly requires a minimum of 20 gallons for healthy adults. The minimum is based on 3 inches adult size and territorial range. Plan a tank sized for adult footprint, HOB or canister filter rated 4-6x volume, dechlorinated water, appropriate temperature heater, and stocking-appropriate hardscape.
Water parameters for Balloon Molly
Balloon Molly prefers freshwater parameters: temperature 74-80°F, pH 6.5-7.5, GH 4-12 dGH, KH 3-8 dKH, ammonia + nitrite 0 ppm, nitrate under 20 ppm. Use dechlorinator on every water change.
What Balloon Molly eats
Balloon Molly is a omnivore. Provide a varied diet of pellets, frozen foods, and supplemental greens. Feed twice daily in small portions. Browse our food guides for product recommendations.
Balloon Molly tankmates and compatibility
Balloon Molly works in community tanks with peaceful species in similar size class. Avoid mixing aggressive with passive species.
Balloon Molly adult size and lifespan
Balloon Molly reaches 3 inches at adulthood with a captive lifespan of 2-4 years with proper care.
Can you breed Balloon Molly?
Balloon Molly can be bred in dedicated breeding tanks with appropriate setup and water-chemistry triggers. Research the species-specific breeding requirements before attempting.
Common Balloon Molly diseases and problems
Balloon Molly is susceptible to standard freshwater diseases (ich, columnaris, fin rot, bacterial infections). Quarantine new Balloon Molly for 4 weeks before adding to display.
Where to buy Balloon Molly online
Balloon Molly is sold at LFS, online retailers, and direct from breeders. Browse live Balloon Molly from vetted Fast Aquatics vendors with carrier-tracked overnight shipping, climate-aware hold logic, and a 4-hour DOA window with photo-evidence claims.
Related freshwater species you might also keep
Other species in the same category with care profiles on Fast Aquatics. Click any name for the full husbandry breakdown.