Can black neon tetras live with dwarf neon rainbowfish?

Verdict
Yes

Yes, black neon tetras and dwarf neon rainbowfish can live together. Both are fine at 75–81°F. Plan on at least 20 gal.

Black neon tetraBlack neon tetra73–81°F · pH 5.5–7.5 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Black neon tetra 73–81°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Black neon tetra 5.5–7.5Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Black neon tetra · 1.5 inDwarf neon rainbowfish · 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

Black neon tetraDwarf neon rainbowfish
Temperature73–81 °F75–82 °F
pH5.5–7.56.5–7.5
Adult size1.5 in2.5 in
Minimum tank15 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for black neon tetras

All black neon tetra tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can black neon tetras live with dwarf neon rainbowfish?

Yes, black neon tetras and dwarf neon rainbowfish can live together. Both are fine at 75–81°F. Plan on at least 20 gal.

What temperature suits both black neon tetras and dwarf neon rainbowfish?

75–81 °F. Black neon tetras need 73–81 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do black neon tetras and dwarf neon rainbowfish need together?

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