Can blue gouramis live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Blue gouramis and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 30 gal.

Blue gouramiBlue gourami72–82°F · pH 6–8 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Blue gourami 72–82°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Blue gourami 6–8Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Blue gourami · 5 inDwarf neon rainbowfish · 2.5 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 gouramiDwarf neon rainbowfish
Temperature72–82 °F75–82 °F
pH6–86.5–7.5
Adult size5.0 in2.5 in
Minimum tank30 gal20 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 dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can blue gouramis live with dwarf neon rainbowfish?

Yes. Blue gouramis and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 30 gal.

What temperature suits both blue gouramis and dwarf neon rainbowfish?

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

What size tank do blue gouramis and dwarf neon rainbowfish need together?

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