Can rummy nose tetras live with blue gouramis?

Verdict
Yes

Yes. Rummy nose tetras and blue gouramis make a good pair. Both are fine at 75–82°F. Plan on at least 30 gal.

Rummy nose tetraRummy nose tetra75–84°F · pH 5.5–7 Blue gouramiBlue gourami72–82°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Rummy nose tetra 75–84°Blue gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7Rummy nose tetra 5.5–7Blue gourami 6–8
The green band is the pH both tolerate.

Size to scale

Rummy nose tetra · 2 inBlue gourami · 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

Rummy nose tetraBlue gourami
Temperature75–84 °F72–82 °F
pH5.5–76–8
Adult size2.0 in5.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Better tank mates for blue gouramis

All blue gourami tank mates

Questions

Can rummy nose tetras live with blue gouramis?

Yes. Rummy nose tetras and blue gouramis make a good pair. Both are fine at 75–82°F. Plan on at least 30 gal.

What temperature suits both rummy nose tetras and blue gouramis?

75–82 °F. Rummy nose tetras need 75–84 °F, blue gouramis need 72–82 °F.

What size tank do rummy nose tetras and blue gouramis need together?

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