Can harlequin rasboras live with dwarf gouramis?

Verdict
Yes

Yes. Harlequin rasboras and dwarf gouramis get along in the same tank. Both are fine at 72–80°F. Plan on at least 10 gal.

Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5 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: 72–80°Harlequin rasbora 72–80°Dwarf gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Harlequin rasbora 6–7.5Dwarf gourami 6–7.5
The green band is the pH both tolerate.

Size to scale

Harlequin rasbora · 2 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

Harlequin rasboraDwarf gourami
Temperature72–80 °F72–82 °F
pH6–7.56–7.5
Adult size2.0 in3.0 in
Minimum tank10 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Better tank mates for dwarf gouramis

All dwarf gourami tank mates

Questions

Can harlequin rasboras live with dwarf gouramis?

Yes. Harlequin rasboras and dwarf gouramis get along in the same tank. Both are fine at 72–80°F. Plan on at least 10 gal.

What temperature suits both harlequin rasboras and dwarf gouramis?

72–80 °F. Harlequin rasboras need 72–80 °F, dwarf gouramis need 72–82 °F.

What size tank do harlequin rasboras and dwarf gouramis need together?

At least 10 gal, set by the harlequin rasbora. Add space for each extra fish.