Can paradise fish live with swordtails?

Verdict
Yes

Yes, paradise fish and swordtails can live together. Both are fine at 72–79°F. Plan on at least 30 gal.

Paradise fishParadise fish61–79°F · pH 6–8 SwordtailSwordtail72–79°F · pH 7–8.3

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Paradise fish 61–79°Swordtail 72–79°
The green band is the temperature range both can live in.
456789Both: 7–8Paradise fish 6–8Swordtail 7–8.3
The green band is the pH both tolerate.

Size to scale

Paradise fish · 3.5 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

Paradise fishSwordtail
Temperature61–79 °F72–79 °F
pH6–87–8.3
Adult size3.5 in5.0 in
Minimum tank20 gal30 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atTopMiddle
GroupOne per tankGroups of 3+
DietOmnivoreOmnivore

Better tank mates for paradise fish

All paradise fish tank mates

Better tank mates for swordtails

All swordtail tank mates

Questions

Can paradise fish live with swordtails?

Yes, paradise fish and swordtails can live together. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both paradise fish and swordtails?

72–79 °F. Paradise fish need 61–79 °F, swordtails need 72–79 °F.

What size tank do paradise fish and swordtails need together?

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