Can rainbow sharks live with kissing gouramis?

Verdict
Yes

Yes. Rainbow sharks and kissing gouramis make a good pair. Both are fine at 72–80°F. Plan on at least 55 gal.

Rainbow sharkRainbow shark72–80°F · pH 6.5–7.5 Kissing gouramiKissing gourami72–82°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–80°Rainbow shark 72–80°Kissing gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Rainbow shark 6.5–7.5Kissing gourami 6–8
The green band is the pH both tolerate.

Size to scale

Rainbow shark · 6 inKissing gourami · 10 in0"2"4"6"8"10"
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 sharkKissing gourami
Temperature72–80 °F72–82 °F
pH6.5–7.56–8
Adult size6.0 in10.0 in
Minimum tank55 gal55 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atBottomMiddle
GroupOne per tankAlone or in pairs
DietOmnivoreOmnivore

Better tank mates for rainbow sharks

All rainbow shark tank mates

Better tank mates for kissing gouramis

All kissing gourami tank mates

Questions

Can rainbow sharks live with kissing gouramis?

Yes. Rainbow sharks and kissing gouramis make a good pair. Both are fine at 72–80°F. Plan on at least 55 gal.

What temperature suits both rainbow sharks and kissing gouramis?

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

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

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