Can pearl gouramis live with boesemani rainbowfish?

Verdict
Yes

Yes. Pearl gouramis and boesemani rainbowfish get along in the same tank. Both are fine at 77–82°F. Plan on at least 30 gal.

Pearl gouramiPearl gourami77–82°F · pH 6–7.5 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 77–82°Pearl gourami 77–82°Boesemani rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Pearl gourami 6–7.5Boesemani rainbowfish 7–8
The green band is the pH both tolerate.

Size to scale

Pearl gourami · 5 inBoesemani rainbowfish · 4 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 gouramiBoesemani rainbowfish
Temperature77–82 °F75–82 °F
pH6–7.57–8
Adult size5.0 in4.0 in
Minimum tank30 gal30 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 boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can pearl gouramis live with boesemani rainbowfish?

Yes. Pearl gouramis and boesemani rainbowfish get along in the same tank. Both are fine at 77–82°F. Plan on at least 30 gal.

What temperature suits both pearl gouramis and boesemani rainbowfish?

77–82 °F. Pearl gouramis need 77–82 °F, boesemani rainbowfish need 75–82 °F.

What size tank do pearl gouramis and boesemani rainbowfish need together?

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