Can congo tetras live with flowerhorns?

Verdict
No

No. Congo tetras and flowerhorns should not share a tank. An adult flowerhorn eats fish that fit in its mouth, and at 3 inches congo tetras do.

Congo tetraCongo tetra73–82°F · pH 6–7.5 FlowerhornFlowerhorn80–89°F · pH 7–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 80–82°Congo tetra 73–82°Flowerhorn 80–89°
The green band is the temperature range both can live in.
456789Both: 7–7.5Congo tetra 6–7.5Flowerhorn 7–8
The green band is the pH both tolerate.

Size to scale

Congo tetra · 3 inFlowerhorn · 12 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

Congo tetraFlowerhorn
Temperature73–82 °F80–89 °F
pH6–7.57–8
Adult size3.0 in12.0 in
Minimum tank30 gal75 gal
TemperamentPeacefulAggressive
Swims atMiddleMiddle
GroupGroups of 6+One per tank
DietOmnivoreCarnivore

Better tank mates for congo tetras

All congo tetra tank mates

Questions

Can congo tetras live with flowerhorns?

No. Congo tetras and flowerhorns should not share a tank. An adult flowerhorn eats fish that fit in its mouth, and at 3 inches congo tetras do.

What temperature suits both congo tetras and flowerhorns?

80–82 °F. Congo tetras need 73–82 °F, flowerhorns need 80–89 °F.

What size tank do congo tetras and flowerhorns need together?

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