Can firemouth cichlids live with dwarf neon rainbowfish?

Verdict
Yes

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

Firemouth cichlidFiremouth cichlid75–86°F · pH 6.5–8 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Firemouth cichlid 75–86°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Firemouth cichlid 6.5–8Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Firemouth cichlid · 6 inDwarf neon rainbowfish · 2.5 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 cichlidDwarf neon rainbowfish
Temperature75–86 °F75–82 °F
pH6.5–86.5–7.5
Adult size6.0 in2.5 in
Minimum tank30 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can firemouth cichlids live with dwarf neon rainbowfish?

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

What temperature suits both firemouth cichlids and dwarf neon rainbowfish?

75–82 °F. Firemouth cichlids need 75–86 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do firemouth cichlids and dwarf neon rainbowfish need together?

At least 30 gal, set by the firemouth cichlid. Add space for each extra fish.