Can neon tetras live with black skirt tetras?

Verdict
Yes

Yes. Neon tetras and black skirt tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 15 gal.

Neon tetraNeon tetra72–79°F · pH 6–7 Black skirt tetraBlack skirt tetra70–80°F · pH 6–7.5

Why it works

Water side by side

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

Size to scale

Neon tetra · 1.5 inBlack skirt tetra · 2.5 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

Neon tetraBlack skirt tetra
Temperature72–79 °F70–80 °F
pH6–76–7.5
Adult size1.5 in2.5 in
Minimum tank10 gal15 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for black skirt tetras

All black skirt tetra tank mates

Questions

Can neon tetras live with black skirt tetras?

Yes. Neon tetras and black skirt tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 15 gal.

What temperature suits both neon tetras and black skirt tetras?

72–79 °F. Neon tetras need 72–79 °F, black skirt tetras need 70–80 °F.

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

At least 15 gal, set by the black skirt tetra. Add space for each extra fish.