Can swordtails live with dojo loaches?

Verdict
Yes

Yes, swordtails and dojo loaches can live together. Both are fine at 72–77°F. Plan on at least 55 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Dojo loachDojo loach59–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Swordtail 72–79°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 7–8Swordtail 7–8.3Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Swordtail · 5 inDojo loach · 6 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

SwordtailDojo loach
Temperature72–79 °F59–77 °F
pH7–8.36.5–8
Adult size5.0 in6.0 in
Minimum tank30 gal55 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupGroups of 3+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for swordtails

All swordtail tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can swordtails live with dojo loaches?

Yes, swordtails and dojo loaches can live together. Both are fine at 72–77°F. Plan on at least 55 gal.

What temperature suits both swordtails and dojo loaches?

72–77 °F. Swordtails need 72–79 °F, dojo loaches need 59–77 °F.

What size tank do swordtails and dojo loaches need together?

At least 55 gal, set by the dojo loach. Add space for each extra fish.