Can cardinal tetras live with dwarf gouramis?

Verdict
Yes

Yes. Cardinal tetras and dwarf gouramis get along in the same tank. Both are fine at 76–82°F. Plan on at least 20 gal.

Cardinal tetraCardinal tetra76–84°F · pH 4.6–7 Dwarf gouramiDwarf gourami72–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–82°Cardinal tetra 76–84°Dwarf gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7Cardinal tetra 4.6–7Dwarf gourami 6–7.5
The green band is the pH both tolerate.

Size to scale

Cardinal tetra · 2 inDwarf gourami · 3 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

Cardinal tetraDwarf gourami
Temperature76–84 °F72–82 °F
pH4.6–76–7.5
Adult size2.0 in3.0 in
Minimum tank20 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Better tank mates for dwarf gouramis

All dwarf gourami tank mates

Questions

Can cardinal tetras live with dwarf gouramis?

Yes. Cardinal tetras and dwarf gouramis get along in the same tank. Both are fine at 76–82°F. Plan on at least 20 gal.

What temperature suits both cardinal tetras and dwarf gouramis?

76–82 °F. Cardinal tetras need 76–84 °F, dwarf gouramis need 72–82 °F.

What size tank do cardinal tetras and dwarf gouramis need together?

At least 20 gal, set by the cardinal tetra. Add space for each extra fish.