Can honey gouramis live with cardinal tetras?

Verdict
Yes

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

Honey gouramiHoney gourami72–82°F · pH 6–7.5 Cardinal tetraCardinal tetra76–84°F · pH 4.6–7

Why it works

Water side by side

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

Size to scale

Honey gourami · 2 inCardinal tetra · 2 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

Honey gouramiCardinal tetra
Temperature72–82 °F76–84 °F
pH6–7.54.6–7
Adult size2.0 in2.0 in
Minimum tank10 gal20 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for honey gouramis

All honey gourami tank mates

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Questions

Can honey gouramis live with cardinal tetras?

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

What temperature suits both honey gouramis and cardinal tetras?

76–82 °F. Honey gouramis need 72–82 °F, cardinal tetras need 76–84 °F.

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

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