Can flowerhorns live with gold barbs?

Verdict
No

No. Flowerhorns and gold barbs should not share a tank. No shared temperature. Flowerhorns need 80–89°F, gold barbs need 64–75°F.

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Flowerhorn 80–89°Gold barb 64–75°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 7–8Flowerhorn 7–8Gold barb 6–8
The green band is the pH both tolerate.

Size to scale

Flowerhorn · 12 inGold barb · 3 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

FlowerhornGold barb
Temperature80–89 °F64–75 °F
pH7–86–8
Adult size12.0 in3.0 in
Minimum tank75 gal20 gal
TemperamentAggressivePeaceful
Swims atMiddleMiddle
GroupOne per tankGroups of 6+
DietCarnivoreOmnivore

Better tank mates for gold barbs

All gold barb tank mates

Questions

Can flowerhorns live with gold barbs?

No. Flowerhorns and gold barbs should not share a tank. No shared temperature. Flowerhorns need 80–89°F, gold barbs need 64–75°F.

What temperature suits both flowerhorns and gold barbs?

None. Flowerhorns need 80–89 °F and gold barbs need 64–75 °F, so the ranges do not meet.

What size tank do flowerhorns and gold barbs need together?

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