Swordtail (Xiphophorus hellerii) is a beginner-level freshwater fish that needs at least 29 gallons and 70-82°F. An active livebearer named for the male's sword-like tail extension. Needs a longer tank and a tight lid.
Care facts at a glance
| Scientific name | Xiphophorus hellerii |
|---|---|
| Family | Poeciliidae |
| Origin | Mexico and Central America |
| Adult size | 4-5 in |
| Minimum tank | 29 gallons |
| Temperature | 70-82°F |
| pH | 7.0-8.4 |
| Temperament | Peaceful; males can squabble |
| Social behavior | Groups; more females than males |
| Swim level | Mid to upper |
| Difficulty | Beginner |
| Diet | Omnivore: flakes, pellets, veggie foods |
| Typical lifespan | 3-5 years |
Quick tips
- Keep one male with several females.
- Needs a tight lid; they jump.
San Diego water
Naturally suited to San Diego's hard, alkaline tap water once it is dechlorinated (the city uses chloramine, so use a conditioner that handles it). Learn the numbers in our San Diego tap water guide.
Before you buy
Make sure your tank is cycled (how to cycle a tank), check your numbers with the water testing guide, and use the compatibility guide to check tankmates. These are general ranges; individual fish and local water vary.
Find it at Pet Zone
Pet Zone Tropical Fish is a San Diego aquarium store with two locations. Stock changes daily, so call ahead if you are after a specific species or plant. Shop online at petzonesd.com.
4160 Convoy St, San Diego, CA 92111
(858) 987-0309
Open daily, 10am-6pm
Aquascaping, planted tanks
4266 University Ave, San Diego, CA 92105
(619) 283-1812
Closed Monday; Tue-Fri 10:30am-6pm, Sat 11am-6pm, Sun 11am-4pm
Monster fish, koi