What size tank does a Swordtail need?

Swordtail needs a minimum of 20 gallons, with 30 gallons recommended. They are middle swimmers. Keep in groups of 3+.

Is Swordtail good for beginners?

Swordtail is rated "beginner" difficulty (1/5). Great for beginners.

What fish are compatible with Swordtail?

Swordtail is peaceful. Compatible tank mates include other peaceful fish with similar water parameters (pH 7-8.5, temp 72-82°F).

Swordtail

Xiphophorus hellerii

Family: Poeciliidae • Origin: Central America

Swordtails are named for the male's distinctive elongated lower tail fin. Hardy, active, and available in many color varieties.

Min Tank

20 gal

Max Size

5.5"

Temperature

72-82°F

7-8.5

Lifespan

4 years

School Size

Swim Level

middle

Hardness

12-25 dGH

peacefulbeginneromnivoreschooling

Is Swordtail Right for Your Tank?

Swordtail is an excellent choice for beginners — rated "beginner" difficulty (1/5). They're hardy, forgiving of minor water parameter fluctuations, and generally easy to feed. A 20-gallon tank minimum is standard — most community setups will accommodate them.

With a peaceful temperament, Swordtail makes a great community fish. They coexist well with other non-aggressive species of similar size. This is a schooling species — keep at least 3 together, or they may become stressed and display abnormal behavior. Expected lifespan: 4 years with proper care.

Common Mistakes with Swordtail

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Keeping fewer than 3 together

Swordtail is a schooling species — they need a group of at least 3 to feel secure. Lone or paired individuals become stressed, hide constantly, and may develop health issues or aggression.

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Relying on a heater without a thermometer

Swordtail needs 72–82°F. Heaters malfunction or drift over time — always use a separate thermometer to verify. Temperature swings of even 3–4°F can trigger stress and disease, particularly ich.

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Putting them in a tank under 20 gallons

Many beginners underestimate tank size needs. Swordtail requires at least 20 gallons — ideally 30. Cramped tanks lead to stunted growth, aggression, and poor water quality.