Can kuhli loaches live with black neon tetras?

Verdict
Yes

Yes. Kuhli loaches and black neon tetras get along in the same tank. Both are fine at 75–81°F. Plan on at least 20 gal.

Kuhli loachKuhli loach75–86°F · pH 5.5–7 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: 75–81°Kuhli loach 75–86°Black neon tetra 73–81°
The green band is the temperature range both can live in.
456789Both: 5.5–7Kuhli loach 5.5–7Black neon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Kuhli loach · 3.5 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

Kuhli loachBlack neon tetra
Temperature75–86 °F73–81 °F
pH5.5–75.5–7.5
Adult size3.5 in1.5 in
Minimum tank20 gal15 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for kuhli loaches

All kuhli loach tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can kuhli loaches live with black neon tetras?

Yes. Kuhli loaches and black neon tetras get along in the same tank. Both are fine at 75–81°F. Plan on at least 20 gal.

What temperature suits both kuhli loaches and black neon tetras?

75–81 °F. Kuhli loaches need 75–86 °F, black neon tetras need 73–81 °F.

What size tank do kuhli loaches and black neon tetras need together?

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