Can discus live with ember tetras?

Verdict
No

No. Discus and ember tetras should not share a tank. At 6 inches a discus can swallow a 0.8-inch ember tetra whole.

DiscusDiscus82–88°F · pH 5.5–7 Ember tetraEmber tetra73–84°F · pH 5.5–7

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 82–84°Discus 82–88°Ember tetra 73–84°
The green band is the temperature range both can live in.
456789Both: 5.5–7Discus 5.5–7Ember tetra 5.5–7
The green band is the pH both tolerate.

Size to scale

Discus · 6 inEmber tetra · 0.8 in0"1"2"3"4"5"6"
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

DiscusEmber tetra
Temperature82–88 °F73–84 °F
pH5.5–75.5–7
Adult size6.0 in0.8 in
Minimum tank55 gal5 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 5+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for discus

All discus tank mates

Better tank mates for ember tetras

All ember tetra tank mates

Questions

Can discus live with ember tetras?

No. Discus and ember tetras should not share a tank. At 6 inches a discus can swallow a 0.8-inch ember tetra whole.

What temperature suits both discus and ember tetras?

82–84 °F. Discus need 82–88 °F, ember tetras need 73–84 °F.

What size tank do discus and ember tetras need together?

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