Can zebra danios live with swordtails?

Verdict
Yes

Yes. Zebra danios and swordtails make a good pair. Both are fine at 72–77°F. Plan on at least 30 gal.

Zebra danioZebra danio65–77°F · pH 6.5–8 SwordtailSwordtail72–79°F · pH 7–8.3

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Zebra danio 65–77°Swordtail 72–79°
The green band is the temperature range both can live in.
456789Both: 7–8Zebra danio 6.5–8Swordtail 7–8.3
The green band is the pH both tolerate.

Size to scale

Zebra danio · 2 inSwordtail · 5 in0"1"2"3"4"5"6"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

Zebra danioSwordtail
Temperature65–77 °F72–79 °F
pH6.5–87–8.3
Adult size2.0 in5.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atTopMiddle
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for zebra danios

All zebra danio tank mates

Better tank mates for swordtails

All swordtail tank mates

Questions

Can zebra danios live with swordtails?

Yes. Zebra danios and swordtails make a good pair. Both are fine at 72–77°F. Plan on at least 30 gal.

What temperature suits both zebra danios and swordtails?

72–77 °F. Zebra danios need 65–77 °F, swordtails need 72–79 °F.

What size tank do zebra danios and swordtails need together?

At least 30 gal, set by the swordtail. Add space for each extra fish.