Can black skirt tetras live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Black skirt tetras and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 20 gal.

Black skirt tetraBlack skirt tetra70–80°F · pH 6–7.5 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: 75–80°Black skirt tetra 70–80°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Black skirt tetra 6–7.5Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Black skirt tetra · 2.5 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 skirt tetraDwarf neon rainbowfish
Temperature70–80 °F75–82 °F
pH6–7.56.5–7.5
Adult size2.5 in2.5 in
Minimum tank15 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for black skirt tetras

All black skirt tetra tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can black skirt tetras live with dwarf neon rainbowfish?

Yes. Black skirt tetras and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 20 gal.

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

75–80 °F. Black skirt tetras need 70–80 °F, dwarf neon rainbowfish need 75–82 °F.

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

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