Can congo tetras live with firemouth cichlids?

Verdict
Yes

Yes, congo tetras and firemouth cichlids can live together. Both are fine at 75–82°F. Plan on at least 30 gal.

Congo tetraCongo tetra73–82°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: 75–82°Congo tetra 73–82°Firemouth cichlid 75–86°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Congo tetra 6–7.5Firemouth cichlid 6.5–8
The green band is the pH both tolerate.

Size to scale

Congo tetra · 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

Congo tetraFiremouth cichlid
Temperature73–82 °F75–86 °F
pH6–7.56.5–8
Adult size3.0 in6.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Questions

Can congo tetras live with firemouth cichlids?

Yes, congo tetras and firemouth cichlids can live together. Both are fine at 75–82°F. Plan on at least 30 gal.

What temperature suits both congo tetras and firemouth cichlids?

75–82 °F. Congo tetras need 73–82 °F, firemouth cichlids need 75–86 °F.

What size tank do congo tetras and firemouth cichlids need together?

At least 30 gal, set by the congo tetra. Add space for each extra fish.