Can bichirs live with firemouth cichlids?

Verdict
Yes

Yes. Bichirs and firemouth cichlids get along in the same tank. Both are fine at 75–82°F. Plan on at least 75 gal.

BichirBichir72–82°F · pH 6.5–7.5 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°Bichir 72–82°Firemouth cichlid 75–86°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Bichir 6.5–7.5Firemouth cichlid 6.5–8
The green band is the pH both tolerate.

Size to scale

Bichir · 12 inFiremouth cichlid · 6 in0"2"4"6"8"10"12"
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

BichirFiremouth cichlid
Temperature72–82 °F75–86 °F
pH6.5–7.56.5–8
Adult size12.0 in6.0 in
Minimum tank75 gal30 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atBottomBottom
GroupAlone or in pairsAlone or in pairs
DietCarnivoreOmnivore

Better tank mates for bichirs

All bichir tank mates

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Questions

Can bichirs live with firemouth cichlids?

Yes. Bichirs and firemouth cichlids get along in the same tank. Both are fine at 75–82°F. Plan on at least 75 gal.

What temperature suits both bichirs and firemouth cichlids?

75–82 °F. Bichirs need 72–82 °F, firemouth cichlids need 75–86 °F.

What size tank do bichirs and firemouth cichlids need together?

At least 75 gal, set by the bichir. Add space for each extra fish.