Can pearl gouramis live with cardinal tetras?

Verdict
Yes

Yes, pearl gouramis and cardinal tetras can live together. Both are fine at 77–82°F. Plan on at least 30 gal.

Pearl gouramiPearl gourami77–82°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: 77–82°Pearl gourami 77–82°Cardinal tetra 76–84°
The green band is the temperature range both can live in.
456789Both: 6–7Pearl gourami 6–7.5Cardinal tetra 4.6–7
The green band is the pH both tolerate.

Size to scale

Pearl gourami · 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

Pearl gouramiCardinal tetra
Temperature77–82 °F76–84 °F
pH6–7.54.6–7
Adult size5.0 in2.0 in
Minimum tank30 gal20 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for pearl gouramis

All pearl gourami tank mates

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Questions

Can pearl gouramis live with cardinal tetras?

Yes, pearl gouramis and cardinal tetras can live together. Both are fine at 77–82°F. Plan on at least 30 gal.

What temperature suits both pearl gouramis and cardinal tetras?

77–82 °F. Pearl gouramis need 77–82 °F, cardinal tetras need 76–84 °F.

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

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