Black Marble Swordtail – Xiphophorus hellerii
The Black Marble Swordtail, Xiphophorus hellerii, is an attractive selectively bred livebearer recognised by its contrasting black marbled pattern across a lighter body, with mature males developing the characteristic elongated lower tail ray known as the sword. This ornamental strain shares the hardy nature and active swimming behaviour of the classic Green Swordtail, making it a popular choice for spacious freshwater community aquariums.
Black Marble Swordtails are active omnivores that appreciate planted areas, open swimming room and moderately hard, alkaline water. Their easy breeding behaviour and striking individual colour variation make them particularly appealing to both beginner and experienced aquarists.
| Key Features | Details |
|---|---|
| Species | Xiphophorus hellerii |
| Gender | Males develop elongated tail (sword) |
| Water Conditions | Moderately hard, alkaline water |
| Feeding | Omnivorous; benefits from plant-rich environments |
| Compatibility | Best suited for spacious community tanks |
FAQ
What is the difference between Black Marble Swordtail and Green Swordtail?
Black Marble Swordtail has a marbled black and light body pattern, while Green Swordtail has a uniform green body with a distinct sword tail. Both are hardy and active, but Black Marble shows more variation in coloration and is known for its striking marbled appearance.
How big do Black Marble Swordtails grow?
Adult males typically grow to about 3 to 4 inches in length, with the tail extending significantly beyond the body. The sword tail can reach up to 2 inches in length when fully developed.
Are Black Marble Swordtails suitable for beginners?
Yes, they are well-suited for beginners due to their hardy nature, active behavior, and ease of care. They thrive in well-planted tanks with moderate water conditions.
Blake Hemmings –
I’ve had these fish for three months now and they’re very active and colorful. The marbled pattern is unique and stands out in the tank. They enjoy the plants and swim freely. Easy to care for and breed naturally, which is great for a beginner.
Brandon Greene –
The fish are beautiful and quite lively. I noticed some variation in color between individuals, which adds interest. They do need a bit of space and a well-planted tank, but overall they’re a joy to have.
Una Underwood –
I bought them for my community tank and they’ve been thriving. The sword tail is impressive and they eat well on a mix of flakes and live foods. They don’t stress easily and adapt quickly to the environment.