Can firemouth cichlids live with silver dollars?

Verdict
Yes

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

Firemouth cichlidFiremouth cichlid75–86°F · pH 6.5–8 Silver dollarSilver dollar75–82°F · pH 5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Firemouth cichlid 75–86°Silver dollar 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7Firemouth cichlid 6.5–8Silver dollar 5–7
The green band is the pH both tolerate.

Size to scale

Firemouth cichlid · 6 inSilver dollar · 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

Firemouth cichlidSilver dollar
Temperature75–86 °F75–82 °F
pH6.5–85–7
Adult size6.0 in6.0 in
Minimum tank30 gal75 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 5+
DietOmnivoreHerbivore

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can firemouth cichlids live with silver dollars?

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

What temperature suits both firemouth cichlids and silver dollars?

75–82 °F. Firemouth cichlids need 75–86 °F, silver dollars need 75–82 °F.

What size tank do firemouth cichlids and silver dollars need together?

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