Can neon tetras live with congo tetras?

Verdict
Yes

Yes. Neon tetras and congo tetras get along in the same tank. Both are fine at 73–79°F. Plan on at least 30 gal.

Neon tetraNeon tetra72–79°F · pH 6–7 Congo tetraCongo tetra73–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Neon tetra 72–79°Congo tetra 73–82°
The green band is the temperature range both can live in.
456789Both: 6–7Neon tetra 6–7Congo tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Neon tetra · 1.5 inCongo tetra · 3 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

Neon tetraCongo tetra
Temperature72–79 °F73–82 °F
pH6–76–7.5
Adult size1.5 in3.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for congo tetras

All congo tetra tank mates

Questions

Can neon tetras live with congo tetras?

Yes. Neon tetras and congo tetras get along in the same tank. Both are fine at 73–79°F. Plan on at least 30 gal.

What temperature suits both neon tetras and congo tetras?

73–79 °F. Neon tetras need 72–79 °F, congo tetras need 73–82 °F.

What size tank do neon tetras and congo tetras need together?

At least 30 gal, set by the congo tetra. Add space for each extra fish.