🎾Enriching a Swordtail tank: hardscape, shoal and occupation
Swordtail : Plants around the edges and a large central swimming space, essential for this sprinter. Driftwood and rocks mark out territories and ease rivalry between males.
In short: 8 to 12 cm as an adult including the sword, 100 L minimum, water between 22 and 26 °C. A sprinting swimmer, sometimes quarrelsome between males, it needs a long swimming lane and a single male or a female majority. An outstanding jumper needing a full lid and a tank at least 80 cm long, in moderately hard, well-oxygenated water.
Hardscape designed for its swimming zone
With a Swordtail, everything happens in midwater — furnish accordingly: structure the space with tall plants along the back, wood shelters and swimming lanes left clear. An aquarium’s enrichment is its hiding places and its currents — not fluorescent ornaments.
Group life: the first enrichment
From 4 individuals up, the Swordtail becomes itself again: hierarchies settling, displays, coordinated swimming — in small numbers it lives in chronic stress and loses its colours — group size is the species’ first “toy”, before any decor purchase.
Food as occupation
Turn every meal into exercise: frozen prey released into the current makes the Swordtail hunt, with the feeding spot moving day to day — foraging is its real “toy”.
Frequently asked questions
How many Swordtail should be kept together?
4 minimum, more if the tank allows: it is a group species, and numbers shape its behaviour and colours alike.
How do you enrich a Swordtail tank?
Three levers: decor set to its zone (in midwater), feeding that changes form and place, and group numbers. The rest is marketing.
The guides that apply to you
- The Goldfish's Three-Second Memory: A Persistent Myth
No, a goldfish doesn't forget everything in three seconds. Science shows a far more developed memory, with real implications for enrichment.
- Low-tech aquarium: the method to save money without shortchanging the fish
The low-tech aquarium bets on plants rather than technology: no CO2, sometimes no heater, reduced maintenance. Budget, suitable species and setup method.
- Driftwood and rocks for aquariums: which ones are safe for your fish?
Which driftwood and rocks are safe in an aquarium? Tannin-releasing woods, limestone rocks to avoid, the vinegar test and preparation: the complete guide.
- Should you regularly change the aquarium's decor?
Rotating rocks, plants or hiding spots can stimulate fish used to a fixed layout — but a poorly handled change can also destabilise an established territory. How to tell the difference.