Can firemouth cichlids live with kissing gouramis?

Verdict
Yes

Yes, firemouth cichlids and kissing gouramis can live together. Both are fine at 75–82°F. Plan on at least 55 gal.

Firemouth cichlidFiremouth cichlid75–86°F · pH 6.5–8 Kissing gouramiKissing gourami72–82°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Firemouth cichlid 75–86°Kissing gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–8Firemouth cichlid 6.5–8Kissing gourami 6–8
The green band is the pH both tolerate.

Size to scale

Firemouth cichlid · 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

Firemouth cichlidKissing gourami
Temperature75–86 °F72–82 °F
pH6.5–86–8
Adult size6.0 in10.0 in
Minimum tank30 gal55 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atBottomMiddle
GroupAlone or in pairsAlone or in pairs
DietOmnivoreOmnivore

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Better tank mates for kissing gouramis

All kissing gourami tank mates

Questions

Can firemouth cichlids live with kissing gouramis?

Yes, firemouth cichlids and kissing gouramis can live together. Both are fine at 75–82°F. Plan on at least 55 gal.

What temperature suits both firemouth cichlids and kissing gouramis?

75–82 °F. Firemouth cichlids need 75–86 °F, kissing gouramis need 72–82 °F.

What size tank do firemouth cichlids and kissing gouramis need together?

At least 55 gal, set by the kissing gourami. Add space for each extra fish.