Can blue gouramis live with boesemani rainbowfish?

Verdict
Yes

Yes. Blue gouramis and boesemani rainbowfish make a good pair. Both are fine at 75–82°F. Plan on at least 30 gal.

Blue gouramiBlue gourami72–82°F · pH 6–8 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Blue gourami 72–82°Boesemani rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 7–8Blue gourami 6–8Boesemani rainbowfish 7–8
The green band is the pH both tolerate.

Size to scale

Blue 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

Blue gouramiBoesemani rainbowfish
Temperature72–82 °F75–82 °F
pH6–87–8
Adult size5.0 in4.0 in
Minimum tank30 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for blue gouramis

All blue gourami tank mates

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can blue gouramis live with boesemani rainbowfish?

Yes. Blue gouramis and boesemani rainbowfish make a good pair. Both are fine at 75–82°F. Plan on at least 30 gal.

What temperature suits both blue gouramis and boesemani rainbowfish?

75–82 °F. Blue gouramis need 72–82 °F, boesemani rainbowfish need 75–82 °F.

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

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