Can severums live with firemouth cichlids?

Verdict
Yes

Yes. Severums and firemouth cichlids get along in the same tank. Both are fine at 75–84°F. Plan on at least 55 gal.

SeverumSeverum74–84°F · pH 6–7 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: 75–84°Severum 74–84°Firemouth cichlid 75–86°
The green band is the temperature range both can live in.
456789Both: 6.5–7Severum 6–7Firemouth cichlid 6.5–8
The green band is the pH both tolerate.

Size to scale

Severum · 8 inFiremouth cichlid · 6 in0"1"2"3"4"5"6"7"8"
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

SeverumFiremouth cichlid
Temperature74–84 °F75–86 °F
pH6–76.5–8
Adult size8.0 in6.0 in
Minimum tank55 gal30 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleBottom
GroupAlone or in pairsAlone or in pairs
DietOmnivoreOmnivore

Better tank mates for severums

All severum tank mates

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Questions

Can severums live with firemouth cichlids?

Yes. Severums and firemouth cichlids get along in the same tank. Both are fine at 75–84°F. Plan on at least 55 gal.

What temperature suits both severums and firemouth cichlids?

75–84 °F. Severums need 74–84 °F, firemouth cichlids need 75–86 °F.

What size tank do severums and firemouth cichlids need together?

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