Can pearl gouramis live with harlequin rasboras?

Verdict
Yes

Yes. Pearl gouramis and harlequin rasboras get along in the same tank. Both are fine at 77–80°F. Plan on at least 30 gal.

Pearl gouramiPearl gourami77–82°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: 77–80°Pearl gourami 77–82°Harlequin rasbora 72–80°
The green band is the temperature range both can live in.
456789Both: 6–7.5Pearl gourami 6–7.5Harlequin rasbora 6–7.5
The green band is the pH both tolerate.

Size to scale

Pearl gourami · 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

Pearl gouramiHarlequin rasbora
Temperature77–82 °F72–80 °F
pH6–7.56–7.5
Adult size5.0 in2.0 in
Minimum tank30 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for pearl gouramis

All pearl gourami tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can pearl gouramis live with harlequin rasboras?

Yes. Pearl gouramis and harlequin rasboras get along in the same tank. Both are fine at 77–80°F. Plan on at least 30 gal.

What temperature suits both pearl gouramis and harlequin rasboras?

77–80 °F. Pearl gouramis need 77–82 °F, harlequin rasboras need 72–80 °F.

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

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