Can corydoras live with black neon tetras?

Verdict
Yes

Yes, corydoras and black neon tetras can live together. Both are fine at 73–79°F. Plan on at least 20 gal.

CorydorasCorydoras72–79°F · pH 6–7.8 Black neon tetraBlack neon tetra73–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Corydoras 72–79°Black neon tetra 73–81°
The green band is the temperature range both can live in.
456789Both: 6–7.5Corydoras 6–7.8Black neon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Corydoras · 2.5 inBlack neon tetra · 1.5 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

CorydorasBlack neon tetra
Temperature72–79 °F73–81 °F
pH6–7.85.5–7.5
Adult size2.5 in1.5 in
Minimum tank20 gal15 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for corydoras

All corydoras tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can corydoras live with black neon tetras?

Yes, corydoras and black neon tetras can live together. Both are fine at 73–79°F. Plan on at least 20 gal.

What temperature suits both corydoras and black neon tetras?

73–79 °F. Corydoras need 72–79 °F, black neon tetras need 73–81 °F.

What size tank do corydoras and black neon tetras need together?

At least 20 gal, set by the corydoras. Add space for each extra fish.