Can jack dempseys live with swordtails?

Verdict
No

No. Jack dempseys and swordtails should not share a tank. Jack dempseys are aggressive and much bigger than swordtails.

Jack DempseyJack Dempsey72–86°F · pH 6.5–7.5 SwordtailSwordtail72–79°F · pH 7–8.3

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Jack Dempsey 72–86°Swordtail 72–79°
The green band is the temperature range both can live in.
456789Both: 7–7.5Jack Dempsey 6.5–7.5Swordtail 7–8.3
The green band is the pH both tolerate.

Size to scale

Jack Dempsey · 10 inSwordtail · 5 in0"2"4"6"8"10"
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

Jack DempseySwordtail
Temperature72–86 °F72–79 °F
pH6.5–7.57–8.3
Adult size10.0 in5.0 in
Minimum tank55 gal30 gal
TemperamentAggressiveSemi-aggressive
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 3+
DietCarnivoreOmnivore

Better tank mates for jack dempseys

All jack dempsey tank mates

Better tank mates for swordtails

All swordtail tank mates

Questions

Can jack dempseys live with swordtails?

No. Jack dempseys and swordtails should not share a tank. Jack dempseys are aggressive and much bigger than swordtails.

What temperature suits both jack dempseys and swordtails?

72–79 °F. Jack dempseys need 72–86 °F, swordtails need 72–79 °F.

What size tank do jack dempseys and swordtails need together?

At least 55 gal, set by the jack dempsey. Add space for each extra fish.