Can black neon tetras live with endlers?

Verdict
Yes

Yes. Black neon tetras and endlers get along in the same tank. Both are fine at 73–81°F. Plan on at least 15 gal.

Black neon tetraBlack neon tetra73–81°F · pH 5.5–7.5 Endler's livebearerEndler's livebearer72–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–81°Black neon tetra 73–81°Endler's livebearer 72–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Black neon tetra 5.5–7.5Endler's livebearer 7–8
The green band is the pH both tolerate.

Size to scale

Black neon tetra · 1.5 inEndler's livebearer · 1 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

Black neon tetraEndler's livebearer
Temperature73–81 °F72–82 °F
pH5.5–7.57–8
Adult size1.5 in1.0 in
Minimum tank15 gal5 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for black neon tetras

All black neon tetra tank mates

Better tank mates for endlers

All endler's livebearer tank mates

Questions

Can black neon tetras live with endlers?

Yes. Black neon tetras and endlers get along in the same tank. Both are fine at 73–81°F. Plan on at least 15 gal.

What temperature suits both black neon tetras and endlers?

73–81 °F. Black neon tetras need 73–81 °F, endlers need 72–82 °F.

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

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