Can oscars live with ember tetras?

Verdict
No

No. Oscars and ember tetras should not share a tank. An adult oscar eats fish that fit in its mouth, and at 0.8 inches ember tetras do.

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–81°Oscar 74–81°Ember tetra 73–84°
The green band is the temperature range both can live in.
456789Both: 6–7Oscar 6–8Ember tetra 5.5–7
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inEmber tetra · 0.8 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

OscarEmber tetra
Temperature74–81 °F73–84 °F
pH6–85.5–7
Adult size12.0 in0.8 in
Minimum tank75 gal5 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 ember tetras

All ember tetra tank mates

Questions

Can oscars live with ember tetras?

No. Oscars and ember tetras should not share a tank. An adult oscar eats fish that fit in its mouth, and at 0.8 inches ember tetras do.

What temperature suits both oscars and ember tetras?

74–81 °F. Oscars need 74–81 °F, ember tetras need 73–84 °F.

What size tank do oscars and ember tetras need together?

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