Can dwarf neon rainbowfish live with endlers?

Verdict
Yes

Yes. Dwarf neon rainbowfish and endlers make a good pair. Both are fine at 75–82°F. Plan on at least 20 gal.

Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5 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: 75–82°Dwarf neon rainbowfish 75–82°Endler's livebearer 72–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Dwarf neon rainbowfish 6.5–7.5Endler's livebearer 7–8
The green band is the pH both tolerate.

Size to scale

Dwarf neon rainbowfish · 2.5 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

Dwarf neon rainbowfishEndler's livebearer
Temperature75–82 °F72–82 °F
pH6.5–7.57–8
Adult size2.5 in1.0 in
Minimum tank20 gal5 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Better tank mates for endlers

All endler's livebearer tank mates

Questions

Can dwarf neon rainbowfish live with endlers?

Yes. Dwarf neon rainbowfish and endlers make a good pair. Both are fine at 75–82°F. Plan on at least 20 gal.

What temperature suits both dwarf neon rainbowfish and endlers?

75–82 °F. Dwarf neon rainbowfish need 75–82 °F, endlers need 72–82 °F.

What size tank do dwarf neon rainbowfish and endlers need together?

At least 20 gal, set by the dwarf neon rainbowfish. Add space for each extra fish.