Can swordtails live with dwarf gouramis?

Verdict
Yes

Yes. Swordtails and dwarf gouramis get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Dwarf gouramiDwarf gourami72–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Swordtail 72–79°Dwarf gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Swordtail 7–8.3Dwarf gourami 6–7.5
The green band is the pH both tolerate.

Size to scale

Swordtail · 5 inDwarf gourami · 3 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

SwordtailDwarf gourami
Temperature72–79 °F72–82 °F
pH7–8.36–7.5
Adult size5.0 in3.0 in
Minimum tank30 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleTop
GroupGroups of 3+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for swordtails

All swordtail tank mates

Better tank mates for dwarf gouramis

All dwarf gourami tank mates

Questions

Can swordtails live with dwarf gouramis?

Yes. Swordtails and dwarf gouramis get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both swordtails and dwarf gouramis?

72–79 °F. Swordtails need 72–79 °F, dwarf gouramis need 72–82 °F.

What size tank do swordtails and dwarf gouramis need together?

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