Can oscars live with congo tetras?

Verdict
No

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

OscarOscar74–81°F · pH 6–8 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: 74–81°Oscar 74–81°Congo tetra 73–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Oscar 6–8Congo tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inCongo tetra · 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

OscarCongo tetra
Temperature74–81 °F73–82 °F
pH6–86–7.5
Adult size12.0 in3.0 in
Minimum tank75 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for congo tetras

All congo tetra tank mates

Questions

Can oscars live with congo tetras?

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

What temperature suits both oscars and congo tetras?

74–81 °F. Oscars need 74–81 °F, congo tetras need 73–82 °F.

What size tank do oscars and congo tetras need together?

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