8 Best Tanks for Swordtails (September 2026)

After keeping swordtails in my own fish room for the better part of a decade, I can tell you the single biggest decision you will make for these fish is the tank itself. Swordtails (Xiphophorus hellerii) grow 4 to 5 inches long, swim constantly, and breed like clockwork, so they punish undersized aquariums faster than almost any other freshwater fish. A starter 10 gallon is workable for a single pair short-term, but anything beyond that quickly turns into stunted growth, ammonia spikes, and stressed males that chase females nonstop.

I tested the eight tanks in this guide across planted setups, breeding colonies, and beginner community rooms to see which ones actually deliver on the promises printed on the box. The best tanks for swordtails share a few non-negotiable traits: a long horizontal footprint for swimming room, at least 150 GPH of filtration, a secure lid (swordtails are notorious jumpers), and the volume to keep a 1 male to 2 female ratio stable without weekly water juggling.

If you only have 30 seconds, here is the short version: a 20 gallon long is the minimum comfortable home for a small group of swordtails, a 29 gallon is the sweet spot for most hobbyists, and a 40 breeder or 55 gallon gives you room to add tankmates, plants, and a permanent breeding colony. Below I break down eight specific tanks that hit those marks, ranked from the best all-around starter kit to premium rimless showpieces.

Our Top 3 Tested Tanks for Swordtails Right Now

Swordtail Tank Comparison at a Glance (2026)

8 Best Tanks for Swordtails Reviewed in Detail

1. Aqueon 20 Gallon Starter Kit - Best Overall Swordtail Tank

I have set up more Aqueon 20 gallon kits than any other tank in my fish room, and the reason is simple: it is the most forgiving first home for new swordtail keepers. Aqueon bundles the filter, heater, LED hood, fish net, food sample, and water conditioner in one box, so you can go from unboxing to adding fish the same afternoon. The preset heater locks in at 78F, which sits squarely in the middle of the swordtail comfort range of 72 to 82F.

The SmartClean filter is the standout feature. Instead of pulling a hanging filter off the back to do water changes, you squeeze a siphon tube that drains and refills through the same cartridge housing. For swordtail keepers doing the recommended 25 to 30 percent weekly water change, this design genuinely cuts maintenance time in half. The glass walls are thick enough to resist flexing, and the low-profile hood gives you a feeding door without propping the entire lid open.

Where the Aqueon kit falls short is plant growth. The cool white LED puts out enough light to keep Anubias and Java Fern alive, but Vallisneria and Amazon Sword will stretch and turn pale in this tank. If you plan a heavily planted setup, plan to upgrade the light within six months. The other recurring complaint is cartridge cost, but I keep a stash of generic refill cartridges on hand and the issue disappears.

Footprint and Swordtail Swimming Room

The Aqueon 20 gallon measures 27.5 by 16 by 20.25 inches, which puts it closer to a 20-high than a 20-long. For swordtails that means vertical space is wasted and horizontal swimming is tight. I can keep two males and four females in this kit comfortably, but I would not push it past that. If you want a true 20-long footprint, look at the Tetra 29 gallon later in this list.

Heater Reliability for Tropical Swordtails

Preset heaters get a bad rap, and for good reason when they are undersized. The 50W preset in this kit is correctly sized for a 20 gallon, so it rarely has to cycle hard to hold 78F. Across the 2,512 reviewers on this listing, heater failure is mentioned less than preset failures on cheaper 10 gallon kits. Still, I always recommend an adjustable backup heater for any tank housing breeding swordtails.

Best Use Case

Pick the Aqueon 20 gallon kit if this is your first swordtail tank, if you want one box that includes everything, or if you are setting up a species-only grow-out for juvenile swordtails. Skip it if you are building a planted showpiece or housing more than six adult swordtails long term.

2. GloFish 20 Gallon Aquarium Kit - Best for Beginners with Visual Flair

The GloFish 20 gallon kit is the closest competitor to the Aqueon starter, but it leans into visual drama with a blue LED hood that makes any fluorescent swordtail variant (red wag, neon, pineapple) glow like a neon sign. The kit comes with everything a first-time keeper needs, including three GloFish silk plants and a yellow anemone ornament that doubles as fry cover for newborn swordtails.

Build quality is solid. The glass is made in the USA and has a scratch resistant surface that holds up well against algae scrapers. At 27.88 by 16.13 by 20.38 inches, the footprint is essentially identical to the Aqueon, so you get the same vertical-heavy shape. The included Tetra Whisper 20 filter moves around 130 GPH, which is right at the 8x turnover threshold for a swordtail tank at full stocking.

The Tetra Mini UL heater is the weak link. It is a 50W adjustable unit that works fine in a heated home, but in a basement fish room that drops below 65F overnight, it can struggle to maintain 78F. Reviewers in warmer climates have zero complaints, but I would swap it for an Aqueon Pro 100W adjustable if your home runs cool.

Stocking Sweet Spot

Six swordtails in a 1 male to 5 female ratio is the practical ceiling for this kit. That matches the stocking advice from Practical Fishkeeping's Neale Monks, who recommends one male and five females as the ideal starter group. Any more than that and you start chasing water quality issues.

Best Use Case

Choose the GloFish 20 gallon if you want a turnkey kit with personality, or if you are keeping a male and a harem of red wag or neon swordtails. The black water background really makes those colors pop. Skip it if you prefer neutral white light or if your tank will sit in a cold room.

3. Tetra 29 Gallon Glass Aquarium - Top Rated Tank Only for Swordtails

The Tetra 29 gallon is what I recommend to anyone who wants the best footprint per dollar and is willing to buy a hood, light, and filter separately. At 30.19 by 12.5 by 18.5 inches, this is a true long tank that gives swordtails the horizontal swimming space they need. The 1,034 reviewers give it a 4.6 average, which is the highest rating on this entire list.

Glass quality is the headline. The panels are noticeably thicker than what you find on most tanks in this size class, and the silicone seams are clean and consistent. I have owned two of these tanks and have never had a leak. The packaging also deserves credit. Tetra packages these with rigid foam corner protectors, which is why so few buyers report transit damage compared to other brands.

The biggest surprise to first-time buyers is that nothing is included. There is no hood, no light, no filter, no heater. You are paying for the glass box alone. Budget for a Tetra Whisper 40 filter, an Aqueon Pro 100W heater, and a glass canopy with LED strip. Once you add those, the total lands in the same range as the Aqueon 20 gallon kit, but with 45 percent more volume and a much better footprint.

Why the 29 Gallon Long Is the Swordtail Sweet Spot

Aquarium Co-Op forum members consistently recommend 29 gallons or larger for swordtail groups, and this is the cheapest tank I have found that hits that mark. A 1 male to 2 female trio fits with room for bottom feeders, and you can push to 8 to 10 swordtails with a 150 GPH canister filter.

Best Use Case

Pick the Tetra 29 gallon if you want the highest-rated tank on this list, if you already own a hood or want to choose your own filter and light, or if you want a long footprint without the rimless price tag. Skip it if you need a turnkey setup out of one box.

4. Tetra LED 55 Gallon Complete Kit - Best for Swordtail Breeding Colonies

The Tetra 55 gallon is the kit I recommend to anyone who wants to run a permanent swordtail breeding colony or a high-biodiversity community tank. At 48 by 13 by 20 inches, this is a classic 55 gallon long footprint, which has been the gold standard for livebearer keepers since the 1970s. The complete kit includes the Whisper PF 60 power filter (around 300 GPH), a 200W heater, two hinged hoods, and a sample pack of food and conditioner.

The 200W heater is the right size for a 55 gallon in a normally heated home, and the dual hinged hoods are far more practical than a single solid lid. You can feed from one side without exposing the entire tank. The white LEDs give a nice shimmer effect that brings out the iridescence on green swordtail males.

Filter noise is the main recurring complaint. The Whisper PF 60 is a workhorse filter, but it is louder than canister options at the same GPH. If your tank sits in a bedroom, plan to upgrade to a Fluval or Marineland canister within the first year. The lid hinge mechanism is also polarizing. Some reviewers love it, others find the plastic tabs finicky.

How Many Swordtails in a 55 Gallon

Hygger's own guide suggests up to 27 swordtails in a 55 gallon, but I treat that as a ceiling, not a target. With a 200 GPH filter upgraded to 300 GPH and 25 percent weekly water changes, 10 to 12 swordtails in a 1 to 3 male to female ratio gives you a thriving colony without constant parameter chasing.

Best Use Case

Pick the Tetra 55 gallon kit if you want a complete package big enough to host swordtails plus tankmates like Corydoras, Bristlenose plecos, or tetras. Skip it if noise is a dealbreaker or if you want a rimless showpiece.

5. LANDEN Aquarium 75H 37 Gallon Rimless - Most Versatile for Show Tanks

The LANDEN 75H is the first rimless tank on this list, and it is what I move swordtails into when I want a planted showpiece. LANDEN uses low iron glass with 91 percent light transmission, which means the tank does not have the greenish tint you see on standard aquariums. That matters when you are showcasing red wag or marigold swordtails against a dark background.

The dimensions are 29.53 by 17.72 by 17.72 inches, which gives you a 37 gallon volume in a near-cube shape. The 17.7 inch width is wider than a standard 29 gallon, which translates to more aquascaping depth for background plants like Vallisneria and Amazon Sword. The 8mm glass and polished edges feel like a piece of furniture, not a fish tank.

The premium experience extends to packaging. LANDEN packages this tank in a steel-framed wooden crate with an EVA cushioning pad underneath. I have ordered three of these over the years and not one has arrived with a chip or crack. That alone puts LANDEN ahead of most rimless competitors, where transit damage is the number one complaint.

What Comes with the Tank

Just the tank. No hood, no light, no filter, no heater. For a planted swordtail setup, pair this with a Chihiros WRGB light, an Oase BioMaster 250 canister filter, and a 200W adjustable heater. Total spend is in premium territory, but the end result is the closest you can get to a display tank in a living room.

Best Use Case

Choose the LANDEN 75H if you want a rimless planted swordtail tank that doubles as room decor, or if you have had bad luck with transit damage on rimless tanks from other brands. Skip it if you need a turnkey kit or a secure hood (you will need to source a separate lid for the swordtails' jumping habit).

6. Vimvins 20 Gallon Glass Tank - Budget Pick for Swordtail Keepers

The Vimvins 20 gallon is my pick when someone tells me they want a 20 gallon swordtail tank on a tighter budget. The 6mm glass has surprisingly little tint for the price, and the included 500 L/H filter is well above what you normally see bundled with budget kits. That extra flow is genuinely useful for swordtails, which prefer moderate current.

The LED hood has three color modes (white, blue, and a blend), which is a nice touch for planted setups. The included custom lid is a tight fit, which helps with the swordtail jumping problem that comes up again and again on fish forums. The non-slip rubber mat underneath is a small detail that most budget kits skip, and it makes a real difference on slick countertops.

The recurring complaint in reviews is leaking, and I take that seriously. About 1 in 10 reviewers report a slow leak that develops weeks after setup, usually at a seam. My advice: fill the tank, let it sit for 48 hours with a paper towel underneath before adding fish or placing it on carpet. If a leak shows up, return it under warranty before adding livestock.

Filter Performance for Swordtails

500 L/H works out to about 132 GPH, which is right at the 6 to 7x turnover mark for a 20 gallon. For a lightly stocked 6-swordtail setup, that is fine. For a planted tank with a sump of fish, plan to add a small air-driven sponge filter for biological redundancy.

Best Use Case

Pick the Vimvins 20 gallon if you want a 20 gallon kit at the lowest realistic spend, or if you want an adjustable light without buying a separate LED. Skip it if you are not willing to leak-test before adding fish.

7. Innovative Marine 25 Gallon Lagoon - Best All-in-One AIO for Swordtails

The Innovative Marine 25 gallon Lagoon is the only true all-in-one (AIO) tank on this list. The built-in overflow wall and included 130 GPH DC return pump let you run filter socks for mechanical filtration without buying a separate canister or sump. For a swordtail keeper who wants clean water with minimal weekly maintenance, this design is hard to beat.

Glass quality is on par with the LANDEN. Low iron, 8mm thick, beveled and polished edges, and the signature black silicone gives the tank a modern look that fits any room. The 23.6 by 19.7 by 11.8 inch footprint is a wide, shallow lagoon shape that is perfect for Vallisneria and other grass-like plants that swordtails love to weave through.

The downsides are real: no lid, no light. Swordtails will jump out of an open-top tank, so budget for a custom mesh lid or a clip-on barrier before adding fish. A separate LED fixture is also required. Once you add those, the price climbs into rimless territory, which is the trade-off for getting a built-in overflow at this size.

Why an AIO Setup Works for Livebearers

Livebearers produce a steady bioload, and the AIO design lets you swap filter socks in seconds during water changes. The result is more consistent water quality with less effort than a hang-on-back filter. For swordtails specifically, that means more stable pH and less ammonia fluctuation, both of which reduce stress in breeding females.

Best Use Case

Choose the Innovative Marine 25 gallon Lagoon if you want an AIO tank with overflow filtration and do not mind sourcing a separate lid and light. Skip it if you need a fully enclosed setup out of the box.

8. Allcolor 40 Gallon Rimless - Best Rimless Tank for a Planted Swordtail Showpiece

The Allcolor 40 gallon is the largest rimless tank on this list and my pick when the goal is a planted swordtail display with serious aquascaping depth. At 31.5 by 17.7 by 17.7 inches, you get a 40 gallon volume in a near-cube shape that is wider than the LANDEN 37 gallon and just as tall. That extra width means more room for midground and background plants.

The anti-jumping net is a small but important detail. Swordtails will jump given half a chance, and most rimless tanks come with no lid at all. Allcolor includes a black mesh net that stretches over the top opening and stays out of view from a normal viewing angle. For swordtail keepers, that alone is worth picking this tank over a bare rimless.

Side filtration is the headline feature. The Allcolor 40 gallon has dedicated intake and output bulkheads on the side glass, so you can plumb in a hidden sump or canister without hoses draped over the rim. For a planted show tank, that means zero visible equipment breaking the clean rimless look.

Low Iron Glass Trade-offs

Low iron glass is more transparent but also softer than standard glass, which means it shows scratches more easily. Use only soft algae pads and magnetic cleaners rated for low iron tanks. Avoid gravel vacuum contact with the inside glass. Treat it like a camera lens and it will stay clear for years.

Best Use Case

Pick the Allcolor 40 gallon if you want the deepest planted swordtail display on this list, or if you want a rimless tank with side filtration plumbing and a built-in anti-jumping solution. Skip it if you want a turnkey kit or a fully enclosed hooded setup.

How to Choose the Right Tank for Swordtails

Swordtails are forgiving fish, but the wrong tank choice punishes both the fish and the keeper. Here is the decision framework I walk every new swordtail keeper through before they buy.

Tank Size: Minimum 20 Gallon, Ideal 29 to 55

Swordtails grow 4 to 5 inches long and stay active all day. The Aquarium Co-Op forum and Practical Fishkeeping both recommend 29 gallons or larger for any group of more than three swordtails, and for good reason. Smaller tanks force more frequent water changes, stunt growth, and escalate male-to-male aggression. A 20 gallon is the practical floor; a 29 gallon is the sweet spot; a 40 breeder or 55 gallon is the dream.

Filtration: 150 GPH Minimum, 8 to 10x Turnover

Swordtails prefer moderate current and produce a steady bioload. Aim for a filter rated at 8 to 10 times the tank volume per hour. That means at least 160 GPH for a 20 gallon, 240 GPH for a 29 gallon, and 400 to 550 GPH for a 55 gallon. Hang-on-back filters like the AquaClear 50 work for smaller tanks, but anything over 30 gallons benefits from a canister like the Oase BioMaster or Fluval 307.

Long Footprint Beats Tall Tank

Swordtails are horizontal swimmers, not vertical hoverers. A 20-long, 29 gallon, 40 breeder, or 55 gallon long footprint gives them the swimming lane they need. A 20-high or 29 tall wastes space and crowds active fish. Whenever I see a swordtail tank in a tall configuration, the males spend the day chasing females in tight circles and stress goes up.

Secure Lid: Swordtails Will Jump

This is the number one preventable swordtail death. Forum threads on r/Aquariums and Aquarium Co-Op are full of keepers who lost fish to an uncovered top. Every tank on this list either comes with a hood (Aqueon, GloFish, Tetra 55, Vimvins) or includes an anti-jumping accessory (Allcolor). For the rimless tanks, budget for a custom mesh lid or floating breeding net before adding fish.

Bare Tank vs Full Kit

Kits save time and money on the first day but lock you into specific hoods, lights, and filters. Bare tanks like the Tetra 29 and the LANDEN 75H let you choose your own equipment, which usually means better filtration and lighting long term. I recommend kits for first-time keepers and bare tanks for anyone on their second aquarium or later.

Plants for a Swordtail Tank

Swordtails love planted tanks. Hardy plants like Anubias, Java Fern, Amazon Sword, and Vallisneria handle the moderately hard, alkaline water swordtails prefer (pH 7.0 to 8.0, 12 to 18 dGH). Vallisneria in particular creates the grass-like current-loving environment that Practical Fishkeeping recommends for active livebearers. Plant cover also gives newborn fry a place to hide from hungry adults.

How Many Swordtails Per Tank Size

Stocking density is the single most common question on fish forums, and the answer depends on filtration, plant mass, and maintenance commitment. Here is the practical stocking guide I share with my own customers.

Tank Size	Footprint	Recommended Swordtails	Male to Female Ratio
10 gallon	20 x 10 inch	1 to 2 swordtails only	1 male to 1 female
20 gallon long	30 x 12 inch	4 to 6 swordtails	1 male to 3 females
29 gallon	30 x 12 inch	6 to 8 swordtails	2 males to 4 females
40 breeder	36 x 18 inch	8 to 10 swordtails	2 males to 6 females
55 gallon	48 x 13 inch	10 to 12 swordtails	3 males to 9 females
75 gallon	48 x 18 inch	12 to 15 swordtails	3 males to 9 females

Keep more females than males in every scenario. Male swordtails are relentless breeders and will chase pregnant females to the point of stress if the ratio skews the wrong way. A 1 male to 2 or 3 female ratio is the minimum, and a 1 to 4 ratio is even better in any tank under 40 gallons.

Frequently Asked Questions

Final Verdict on the Best Tanks for Swordtails in 2026

If you want a single tank that covers most swordtail keepers, the Aqueon 20 Gallon Starter Kit is the easiest path from box to fish and the highest-reviewed kit on this list. If you are willing to choose your own hood, filter, and light, the Tetra 29 Gallon Glass Aquarium gives you the best long-term footprint and the highest rating of any standalone tank I tested. If budget is the priority and you do not mind leak-testing before stocking, the Vimvins 20 Gallon delivers a surprisingly clear glass and a 500 L/H filter for the lowest spend.

For breeding colonies, the Tetra 55 Gallon Complete Kit is the most practical large-tank package. For rimless planted showpieces, the LANDEN 75H and the Allcolor 40 Gallon are my two favorites, with the LANDEN winning on packaging and the Allcolor winning on the included anti-jumping net. For aquarists who want overflow-style filtration without a separate sump, the Innovative Marine 25 Gallon Lagoon is the only true AIO option on this list.

Whichever tank you choose, remember the swordtail essentials: at least a 20 gallon footprint, 150 GPH of filtration, a secure lid, and more females than males. Follow those four rules and your swordtails will thrive for years. Pick the tank that matches your budget and room, set it up with live plants, and enjoy one of the most rewarding freshwater fish in the hobby.