Can sparkling gouramis live with harlequin rasboras?

Verdict
Yes

Yes. Sparkling gouramis and harlequin rasboras make a good pair. Both are fine at 72–80°F. Plan on at least 10 gal.

Sparkling gouramiSparkling gourami72–82°F · pH 6–7.5 Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5

Why it works

Water side by side

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

Size to scale

Sparkling gourami · 1.5 inHarlequin rasbora · 2 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

Sparkling gouramiHarlequin rasbora
Temperature72–82 °F72–80 °F
pH6–7.56–7.5
Adult size1.5 in2.0 in
Minimum tank5 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 4+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for sparkling gouramis

All sparkling gourami tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can sparkling gouramis live with harlequin rasboras?

Yes. Sparkling gouramis and harlequin rasboras make a good pair. Both are fine at 72–80°F. Plan on at least 10 gal.

What temperature suits both sparkling gouramis and harlequin rasboras?

72–80 °F. Sparkling gouramis need 72–82 °F, harlequin rasboras need 72–80 °F.

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

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