Black Swordtail

* Striking black colored fish with a signature “sword” on the males’ tails.
* Peaceful and active, thrives in well-maintained tanks with plenty of hiding spots.
* Easy to care for, prolific breeder, perfect for beginners and community tanks.

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SKU: 1439

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## Black Swordtail: A Striking Addition to Your Freshwater Aquarium

The Black Swordtail is a captivating freshwater fish prized for its stunning black coloration and the signature “sword” on the males’ tail fins. A member of the livebearer family, these active swimmers are a popular choice for both beginners and experienced aquarists.

**Scientific Name:** Xiphophorus hellerii (Black Swordtail is a color variation)

**Water Quality:** They thrive in clean, well-maintained tanks with moderate water flow. Regularly scheduled partial water changes are essential.

**Water Parameters:**
* pH Level: 7.0 – 8.3 (slightly alkaline)
* GH Level: 8 – 20 dGH
* KH Level: 4 – 10 dKH

**Feeding:** Black Swordtails are omnivores. They enjoy a varied diet of high-quality flake food, brine shrimp, bloodworms, and algae wafers. Supplement their diet with blanched vegetables like zucchini or cucumber.

**Tank Mates:** Peaceful community fish are ideal tank mates. Good options include tetras, rasboras, corydoras catfish, and other peaceful livebearers. Avoid housing them with fin nippers or aggressive fish.

**Substrates and Tank Decorations:** Opt for a fine gravel substrate with plenty of hiding places for fry. Live plants provide excellent hiding spots for fry, improve water quality, and add visual interest.

**Suitable Plants:** Swordtails are not known to be heavy plant eaters. Choose a variety of hardy plants like Amazon Swordtails, Java Ferns, Hornwort, or Water Sprite.

**Sexing and Breeding:** Males are easily identified by their elongated lower tail fin resembling a sword and a modified anal fin called a gonopodium. Females lack the sword and are generally larger. Black Swordtails are prolific breeders. Females can store sperm for several months, resulting in multiple broods from a single mating. To protect fry, provide dense vegetation or separate breeding tanks.

**Maximum Size and Longevity:** Males can reach up to 4 inches, while females grow slightly larger. With proper care, Black Swordtails can live for 3-5 years.

**Behavior:** Black Swordtails are peaceful and social fish. Males can be aggressive towards each other, so maintaining a ratio of more females than males (2-3 females per male) is recommended.

**Things to Consider Before Buying:**

* **Tank Size:** They require a minimum tank size of 20 gallons to ensure enough swimming space.
* **Livebearers:** If you don’t want fry, house only females or keep them with fish that will eat the fry.
* **Jumping Tendencies:** Provide a tight-fitting lid to prevent them from jumping out.

**General Information:** Black Swordtails are a relatively inexpensive fish, making them a budget-friendly option for hobbyists.

**Fun Fact:** The “sword” on the male Black Swordtail is not just for show! It’s thought to play a role in attracting females and establishing dominance among males.


My Family



Where I am from


Central America

My behaviour



How do I breed



Can you keep me

Care Level


Potential of Hydrogen

pH Level Aquarium pH measures water acidity/alkalinity. 7 is neutral. Fish have pH preferences; maintain ideal levels for their health and stability.

7.0 – 8.3

General Hardness

GH Level GH (General Hardness) in aquariums measures minerals like calcium and magnesium. It affects fish health by showing water\'s mineral content.

8 – 20 dGH

Carbonate Hardness

KH Level KH (Carbonate Hardness) in an aquarium stabilizes pH. It acts like a shield, keeping the water conditions just right for fish.

0 – 3 dKH


Temperature Ideal temperature needed for fish

21°C – 27°C

How long will I live

Life Span

3 – 5 Years

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