How Much Does Swordtail Fish Ownership Really Cost?
Swordtails cost about the same per fish as a molly, but of the three common livebearers on this site, they're the one that outgrows a 20-gallon starting point the fastest.
How Much Does Swordtail Fish Ownership Really Cost?
Swordtails cost about the same per fish as a molly, but of the three common livebearers on this site, they're the one that outgrows a 20-gallon starting point the fastest. For the full care picture beyond budgeting, see our complete Swordtail care guide, or our companion guides on feeding, handling and breeding, health issues, and tank setup.
The Fish: $3 to $25, More for Lyretail and Specialty Patterns
Standard assorted color swordtails run about $3 to $6 each. LiveAquaria sells Assorted Swordtails in packs of six for $29.99, which works out to roughly $5 per fish, in line with typical retail pricing. Hi-fin and lyretail varieties cost more: LiveAquaria's Hi Fin Lyretail Swordtail six-pack runs $37.99, about $6.30 per fish. Rarer patterns, koi, neon, and red velvet swordtails among them, can reach $15 to $25 or more from specialty sellers.
The male's namesake sword is not just decoration. It plays no role in swimming, but females show a measurable, well-documented preference for males with longer swords, a 1990 study on female mate choice in this exact species found that the strength of the preference actually increases as the gap in sword length grows. It's a textbook example of sexual selection through female choice, and it's a genuine part of why the fancier, longer-finned varieties cost more at the store.
Upfront Setup: $115 to $190, More If You Size Up
| Item | Cost Range |
|---|---|
| 20-gallon long tank | $35 - $60 |
| Aquarium heater | $18 - $30 |
| Filter sized to tank & bioload | $45 - $60 |
| Live or silk plants | $18 - $35 |
20 gallons is the genuine floor for a small trio, one male and two or three females. LiveAquaria lists a 20-gallon minimum for its Assorted Swordtail, but that same retailer's Hi Fin Lyretail Swordtail listing for the identical species recommends an aquarium of at least 30 gallons that is well planted with plenty of room for swimming, and that more generous number shows up repeatedly once you look past the bare minimum. Swordtails are simply more active, open-water swimmers than a molly or platy of similar size, so the real, comfortable starting point costs somewhat more than the table above, since a 29 or 30-gallon tank itself runs higher than the 20-gallon product linked here. Our Swordtail tank setup guide covers exactly what that extra space needs to do, including the secure lid this species genuinely requires.
Live plants aren't just decor here either. A male swordtail can be a persistent, near-constant presence around a female he's courting, and dense planting gives her somewhere to break line of sight, a genuine practical reason to budget for real cover from the start rather than treat it as optional.
Ongoing Costs: $20 to $35 a Month
| Item | Annual Cost |
|---|---|
| Flake/pellet food with real protein and vegetable variety | $25 - $50 |
| Water conditioner | $10 - $15 |
| Water test kit (periodic refill) | $25 - $40 |
Food, water conditioner, occasional filter media replacement, and electricity for the heater and filter make up the bulk of the monthly cost. Taken together, full monthly upkeep on a properly sized setup commonly lands around $20 to $35, a little higher than a molly's, mainly because a bigger, more active fish in a bigger tank eats a bit more and runs a stronger filter. Swordtails are also true dietary generalists rather than the more herbivore-leaning molly, our Swordtail feeding guide covers exactly what that means for what actually goes in the tank.
Vet Costs
As with most aquarium fish, swordtails rarely see a vet in any formal sense. Most of the conditions covered in our Swordtail health issues guide, ich, fin rot, and dropsy among them, get managed at home with water quality correction and over-the-counter medication rather than a clinic visit. Dedicated aquatic vets exist but are uncommon and rarely necessary for a species this hardy.
Lifespan
3 to 5 years on average with stable water quality, the same range as a molly or platy despite the size difference. Our Molly cost guide covers the closest comparison on this site, a similarly priced fish that gets by on a smaller tank.
The Real Cost to Plan For: More Fish, and Possibly the Wrong Fish
This is the detail that catches new owners off guard, and swordtails add a wrinkle mollies and guppies don't. Swordtails are livebearers, females give birth to live, free-swimming fry rather than laying eggs, and a single female can produce roughly 20 to 100 or more fry per brood about every 4 weeks, without needing a fresh mating each time since females store sperm internally. Put a male and female together with no plan, and you'll have meaningfully more swordtails than you started with inside a couple of months.
The second, more species-specific risk is hybridization. Swordtails and platies both belong to the genus Xiphophorus and interbreed readily, deliberate crossbreeding between the two has gone on for close to a century, and by most current accounts most swordtails already sold in the hobby carry at least some platy ancestry from that long history. Keep an unplanned mix of swordtails and platies in the same tank, and the fry you end up with may not be cleanly one species or the other, worth knowing before combining the two just because they're both easy, inexpensive community fish. Our Swordtail handling guide covers the sexing and breeding side of managing this in practice.
Browse the rest of our Fish care guide category, or check the Swordtail encyclopedia profile for more.
Sources & Further Reading
❓ Frequently Asked Questions
How much does a swordtail fish cost?
Standard assorted color varieties run about $3 to $6 each, based on typical six-fish pack pricing from online retailers. Hi-fin and lyretail varieties cost a bit more, roughly $6 to $10 each, and rarer patterns like koi or neon swordtails can reach $15 to $25 or more from specialty sellers.
What does a basic swordtail tank setup cost?
A tank, filter, heater, and live plants commonly runs $115 to $190 using a 20-gallon long tank as the base. That 20-gallon figure is the genuine floor for a small trio though, most direct retailers and care sheets actually recommend stepping up to a 29 or 30-gallon tank as the more realistic starting point, since swordtails are noticeably more active swimmers than a molly or platy, which pushes the real cost somewhat past the table above.
What are the ongoing costs of keeping swordtails?
Modest, similar to a molly's. Food, water conditioner, and occasional test kit refills make up most of the monthly cost, with electricity for the heater and filter adding a little more. Full monthly upkeep on a properly sized setup commonly lands around $20 to $35.
How long do swordtails live?
3 to 5 years on average with stable water quality, the same range as a molly or platy despite the size difference. Genetics and consistent care matter more than any single factor in reaching the upper end of that range.
What's the cost new swordtail owners usually forget to plan for?
Two things, and both come down to livebearer biology. First, more swordtails than you started with, a single female can produce 20 to 100 or more fry roughly every 4 weeks without a fresh mating each time. Second, and more specific to this species, accidental hybrids: swordtails and platies share a genus and interbreed readily, so an unplanned mix of the two can leave you with fry that aren't cleanly one species or the other.
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Written by Mike
Mike is the founder of Beastly Facts and a lifelong reptile enthusiast. He shares his home with Dex, a bearded dragon with strong opinions about crickets and basking schedules. Mike writes in-depth care guides, animal facts, and the occasional short story about life with exotic pets.
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