Molly, Platy, and Swordtail are three closely related livebearing fish from Central America — hardy, colourful, peaceful, and prolific.
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Molly, Platy, and Swordtail are three closely related livebearing fish from Central America — hardy, colourful, peaceful, and prolific. With Guppies, they form the four most common livebearers in the hobby. Excellent for community aquariums.
Native to Central America and Mexico. Larger than other livebearers, often kept in slightly brackish water.
Native to Mexico and Central America. Smallest of the three.
Native to Central America. Named for the long sword-like tail extension on males.
All come in many colours — black, red, blue, orange, gold, calico, and many tail and fin variations.
Peaceful. Excellent community fish with other peaceful species. Males can chase females persistently — keep ratio of 1 male to 2–3 females, or all-male groups (with adequate space to prevent aggression).
Mollies appreciate slight salt (1 tsp/10 L) — but check tankmate tolerance.
Omnivore with high vegetable preference. Quality flake or pellet food, blanched vegetables (spinach, peas, zucchini), occasional protein. Mollies especially need algae and plant matter.
3–5 years (Platy 3–4, Swordtail and Molly 4–5).
Common concerns:
Pros: colourful, peaceful, easy, breed reliably, beginner-friendly. Cons: breed prolifically (mixed-sex tanks fill rapidly), modern strains often inbred, Mollies prefer slightly brackish water.
Difference between the three? Platy: smallest, easiest, no sword. Swordtail: medium, males have long tail extension. Molly: largest, often kept in slightly brackish, plant-eating.
Can I keep all three together? Yes — they get along well, but they can hybridise. Platy × Swordtail crosses are common.
Beginner fish? Yes — among the most beginner-friendly.
How long do they live? 3–5 years.
Can they breed with Guppies? Closely related but typically don't hybridise successfully.
The Livebearers — Mollies, Platies, Swordtails, and More
10–11 minutes
Collage of livebearers — mollies, platies, swordtails. Caption: "BREED ENDLESSLY".
Underwater photograph of mixed livebearers swimming together — colourful platies, mollies, and swordtails, vibrant orange and red colours, planted tank background, gentle natural lighting, 85mm lens at f/2.5, professional aquatic photography.
Livebearers — mollies, platies, swordtails — are hardy beginner-friendly fish that breed prolifically. Today: complete livebearer overview.
⏱ Timestamps 00:00 Intro Hook 01:00 The Livebearer Group 02:30 Setup: Standard Tropical Community 04:00 Diet: Omnivore, Vegetable-Heavy for Mollies 05:30 Social: Schools With Ratio Management 07:00 Health: Velvet, Fin Rot 08:30 3 Biggest Mistakes New Owners Make 10:00 Are Livebearers Right For You? 11:00 Outro
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"Livebearers are some of the most popular and easiest beginner tropical fish — guppies, mollies, platies, swordtails. They give birth to live fry, breed prolifically, and are hardy and colourful. Today: complete livebearer care."
"Family Poeciliidae includes: Guppy — covered separately. Platy — small, colourful, peaceful. Swordtail — medium, males with extended tail sword. Molly — medium, prefer slightly brackish water. Endler's livebearer — tiny, vivid. All are live-bearers. Females give birth to free-swimming fry."
"Tank: 60–100 litres for a small group. Heater: 22–26°C. Filtration: standard. Plants: dense — fry need cover. Mollies benefit from a teaspoon of aquarium salt per 10 litres, though many keep them in pure freshwater."
"Quality tropical flake or pellet. Frozen treats. Mollies particularly benefit from vegetable matter — blanched veg, algae wafers."
"Mixed sex livebearers breed constantly. Ratio: 2–3 females per male to prevent harassment. Single-sex groups for non-breeding setups. Tank mates: peaceful community fish."
"Lifespan 2–5 years. Velvet disease. Fin rot. Modern fancy strains have weaker genetics — quality varies. Find an aquatic vet."
"Mistake one: no plan for fry. Overpopulation. How to avoid: single-sex group, or plan to grow out and rehome fry. Mistake two: aggressive tank mates. Eat fry. How to avoid: peaceful community. Mistake three: cheap pet-shop stock. Often diseased. How to avoid: reputable breeder."
"Checklist: 60+ litre tropical tank. Plan for fry. Quality source. Aquatic vet identified. 2-5 year commitment per fish. Tick four — livebearers are excellent beginner fish."
"That is the livebearer group — hardy, prolific, beautiful. Next species? Comment below. Subscribe and the bell. Next week: the killifish — the colourful brief-lived jewel." (End screen: subscribe button, 'watch next: Killifish' thumbnail, channel logo)