Can tiger barbs live with firemouth cichlids?

Verdict
Yes

Yes. Tiger barbs and firemouth cichlids get along in the same tank. Both are fine at 75–81°F. Plan on at least 30 gal.

Tiger barbTiger barb72–81°F · pH 6–7.5 Firemouth cichlidFiremouth cichlid75–86°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Tiger barb 72–81°Firemouth cichlid 75–86°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Tiger barb 6–7.5Firemouth cichlid 6.5–8
The green band is the pH both tolerate.

Size to scale

Tiger barb · 3 inFiremouth cichlid · 6 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

Tiger barbFiremouth cichlid
Temperature72–81 °F75–86 °F
pH6–7.56.5–8
Adult size3.0 in6.0 in
Minimum tank30 gal30 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for tiger barbs

All tiger barb tank mates

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Questions

Can tiger barbs live with firemouth cichlids?

Yes. Tiger barbs and firemouth cichlids get along in the same tank. Both are fine at 75–81°F. Plan on at least 30 gal.

What temperature suits both tiger barbs and firemouth cichlids?

75–81 °F. Tiger barbs need 72–81 °F, firemouth cichlids need 75–86 °F.

What size tank do tiger barbs and firemouth cichlids need together?

At least 30 gal, set by the tiger barb. Add space for each extra fish.