Can rainbow sharks live with pearl gouramis?

Verdict
Yes

Yes. Rainbow sharks and pearl gouramis get along in the same tank. Both are fine at 77–80°F. Plan on at least 55 gal.

Rainbow sharkRainbow shark72–80°F · pH 6.5–7.5 Pearl gouramiPearl gourami77–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 77–80°Rainbow shark 72–80°Pearl gourami 77–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Rainbow shark 6.5–7.5Pearl gourami 6–7.5
The green band is the pH both tolerate.

Size to scale

Rainbow shark · 6 inPearl 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

Rainbow sharkPearl gourami
Temperature72–80 °F77–82 °F
pH6.5–7.56–7.5
Adult size6.0 in5.0 in
Minimum tank55 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomTop
GroupOne per tankAlone or in pairs
DietOmnivoreOmnivore

Better tank mates for rainbow sharks

All rainbow shark tank mates

Better tank mates for pearl gouramis

All pearl gourami tank mates

Questions

Can rainbow sharks live with pearl gouramis?

Yes. Rainbow sharks and pearl gouramis get along in the same tank. Both are fine at 77–80°F. Plan on at least 55 gal.

What temperature suits both rainbow sharks and pearl gouramis?

77–80 °F. Rainbow sharks need 72–80 °F, pearl gouramis need 77–82 °F.

What size tank do rainbow sharks and pearl gouramis need together?

At least 55 gal, set by the rainbow shark. Add space for each extra fish.