Dec '25 • 🐠 Care Guides & Species
🌿 Molly Fish (Poecilia sphenops) Care Guide
Difficulty: Beginner → IntermediateSize: 3–4.5 inchesTemperament: Peaceful but activeLifespan: 3–5 years
💧 Tank Setup
- Tank Size: 20+ gallons for a small group.
- Water Range: 75–82 °F, pH 7.5–8.5, prefers hard, mineral-rich water.
- Decor: Open swimming space with plants like guppy grass or hornwort.
- Filtration: Steady current and good oxygenation — they love clean, moving water.
💡 Lesser-Known Tip: Mollies do great in slightly brackish water — adding 1 tablespoon of aquarium salt per 5 gallons helps prevent disease and boosts coloration.
🍽️ Diet
- Staple: Algae-based flakes or spirulina pellets.
- Treats: Blanched veggies (zucchini, peas) + live or frozen brine shrimp.
- Feeding Routine: Twice daily — just what they can finish in 1–2 minutes.
💡 Fact: Mollies are constant grazers — in the wild they feed on algae films, so a mature tank with biofilm keeps them happier and healthier.
🧬 Breeding Behavior
- Type: Livebearer — females give birth to live fry every 4–6 weeks.
- Fry Count: 20–100 depending on age and size.
- Gestation: ~30 days; gravid spot near the anal fin darkens before birth.
- Fry Care: Move newborns or provide dense floating plants for cover.
💡 Breeder Insight: Keep a 1 male : 3 female ratio — males chase nonstop, and this reduces stress for females.
🤝 Tank Mates
Excellent with guppies, platies, swordtails, corydoras, and peaceful tetras.Avoid aggressive cichlids or fin-nippers.
Who’s kept mollies in slightly salty water before? 🌊
Share your results — did you notice brighter colors or fewer illnesses? Drop a photo of your favorite color strain (black, dalmatian, gold, or balloon)!
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🌿 Molly Fish (Poecilia sphenops) Care Guide
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