Swordtail — Fish Profile
Xiphophorus helleri
Quick Specs
| Adult Size: | 5.0" |
| Temperament: | semi-aggressive |
| Care Level: | beginner |
| Min Tank Size: | 20 gallons |
| Temperature: | 72-78°F |
| pH Range: | 7.0-8.0 |
| Diet: | omnivore |
| Origin: | Central America |
| Lifespan: | 3-5 years |
Overview
Swordtails are named for the male's distinctive tail extension. They are active livebearers that can be territorial.
Care Guide for Swordtail
Tank Setup
Swordtail requires a minimum tank size of 20 gallons. Maintain water temperature between 72°F and 78°F, with a pH range of 7.0 to 8.0. A properly sized tank with adequate filtration and regular water changes is essential for long-term health. When housing Swordtail with other species, always choose a tank size that accommodates the most demanding fish in the community.
Feeding
Swordtail is a omnivore feeder. Provide a varied diet appropriate for omnivore species to ensure optimal health and coloration. Feed small portions 2–3 times daily, and remove uneaten food after a few minutes to maintain water quality.
Temperament & Compatibility
This species is classified as semi-aggressive. Swordtail reaches an adult size of 5.0 inches and has a care level of beginner. Always research compatibility before adding new fish to an established aquarium. Individual temperament can vary, so monitor new introductions closely for the first 48 hours.
Origin & Lifespan
Swordtail originates from Central America and has an expected lifespan of 3-5 years when kept in proper water conditions with appropriate tank mates and diet.
Compatible Tank Mates
🔴 Risky Tank Mates
Compatibility Results for Swordtail
All 69 compatibility checks involving Swordtail:
Expert Care Tips for Swordtail
- Mid-size tank: Swordtail needs 20+ gallons. Choose a tank at least 2× as long as the fish's adult size (5.0") for adequate swimming room.
- Tropical range: Keep Swordtail at 72–78°F. A 50W heater per 10 gallons is a safe rule of thumb for stable temperature.
- Narrow pH tolerance: Swordtail only tolerates pH 7.0–8.0. Test your tap water before buying — adjusting pH is harder than choosing the right fish for your water.
- Semi-aggressive temperament: Swordtail is generally peaceful but can become territorial. Provide ample hiding spots and avoid housing with fin-nipping species.
- Acclimation: Always drip-acclimate Swordtail over 30–45 minutes. Match temperature and pH gradually to prevent osmotic shock.