The swordtail (Xiphophorus hellerii) is a peaceful fish that grows to about 5 inches and spends its time in mid-water. Keep at least 3 together, in a tank of 30 gallons or more, at 72–79°F and pH 7–8.3.
30 galsmallest tank
5″adult size
72–79°Ftemperature
7–8.3pH
3+group size
Peacefultemperament
Good tankmates
Avoid
- ✕Paradise fish: Paradise fish is aggressive and best kept alone.
- ✕Convict cichlid: Convict cichlid is aggressive and best kept alone.
- ✕Oscar: Oscar is aggressive and best kept alone.
- ✕Kuhli loach: Swordtail and Kuhli loach prefer different water (pH 7–8.3 vs 5.5–6.5).
- ✕Pea puffer: Pea puffer is aggressive and best kept alone.
From TankCoach's own species data: common hobby guidance for adults, rounded. Individual fish vary. Not veterinary advice.