Can jack dempseys live with congo tetras?

Verdict
No

No. Jack dempseys and congo tetras should not share a tank. An adult jack dempsey eats fish that fit in its mouth, and at 3 inches congo tetras do.

Jack DempseyJack Dempsey72–86°F · pH 6.5–7.5 Congo tetraCongo tetra73–82°F · pH 6–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–82°Jack Dempsey 72–86°Congo tetra 73–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Jack Dempsey 6.5–7.5Congo tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Jack Dempsey · 10 inCongo tetra · 3 in0"2"4"6"8"10"
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

Jack DempseyCongo tetra
Temperature72–86 °F73–82 °F
pH6.5–7.56–7.5
Adult size10.0 in3.0 in
Minimum tank55 gal30 gal
TemperamentAggressivePeaceful
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for jack dempseys

All jack dempsey tank mates

Better tank mates for congo tetras

All congo tetra tank mates

Questions

Can jack dempseys live with congo tetras?

No. Jack dempseys and congo tetras should not share a tank. An adult jack dempsey eats fish that fit in its mouth, and at 3 inches congo tetras do.

What temperature suits both jack dempseys and congo tetras?

73–82 °F. Jack dempseys need 72–86 °F, congo tetras need 73–82 °F.

What size tank do jack dempseys and congo tetras need together?

At least 55 gal, set by the jack dempsey. Add space for each extra fish.