Can sparkling gouramis live with cardinal tetras?

Verdict
Yes

Yes, sparkling gouramis and cardinal tetras can live together. Both are fine at 76–82°F. Plan on at least 20 gal.

Sparkling gouramiSparkling 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°Sparkling gourami 72–82°Cardinal tetra 76–84°
The green band is the temperature range both can live in.
456789Both: 6–7Sparkling gourami 6–7.5Cardinal tetra 4.6–7
The green band is the pH both tolerate.

Size to scale

Sparkling gourami · 1.5 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

Sparkling gouramiCardinal tetra
Temperature72–82 °F76–84 °F
pH6–7.54.6–7
Adult size1.5 in2.0 in
Minimum tank5 gal20 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 4+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for sparkling gouramis

All sparkling gourami tank mates

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Questions

Can sparkling gouramis live with cardinal tetras?

Yes, sparkling gouramis and cardinal tetras can live together. Both are fine at 76–82°F. Plan on at least 20 gal.

What temperature suits both sparkling gouramis and cardinal tetras?

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

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

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