Can flowerhorns live with firemouth cichlids?

Verdict
No

No. Flowerhorns and firemouth cichlids should not share a tank. Flowerhorns are aggressive and much bigger than firemouth cichlids.

FlowerhornFlowerhorn80–89°F · pH 7–8 Firemouth cichlidFiremouth cichlid75–86°F · pH 6.5–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 80–86°Flowerhorn 80–89°Firemouth cichlid 75–86°
The green band is the temperature range both can live in.
456789Both: 7–8Flowerhorn 7–8Firemouth cichlid 6.5–8
The green band is the pH both tolerate.

Size to scale

Flowerhorn · 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

FlowerhornFiremouth cichlid
Temperature80–89 °F75–86 °F
pH7–86.5–8
Adult size12.0 in6.0 in
Minimum tank75 gal30 gal
TemperamentAggressiveSemi-aggressive
Swims atMiddleBottom
GroupOne per tankAlone or in pairs
DietCarnivoreOmnivore

Better tank mates for firemouth cichlids

All firemouth cichlid tank mates

Questions

Can flowerhorns live with firemouth cichlids?

No. Flowerhorns and firemouth cichlids should not share a tank. Flowerhorns are aggressive and much bigger than firemouth cichlids.

What temperature suits both flowerhorns and firemouth cichlids?

80–86 °F. Flowerhorns need 80–89 °F, firemouth cichlids need 75–86 °F.

What size tank do flowerhorns and firemouth cichlids need together?

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