Can congo tetras live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Congo tetras and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 30 gal.

Congo tetraCongo tetra73–82°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: 75–82°Congo tetra 73–82°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Congo tetra 6–7.5Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Congo tetra · 3 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

Congo tetraDwarf neon rainbowfish
Temperature73–82 °F75–82 °F
pH6–7.56.5–7.5
Adult size3.0 in2.5 in
Minimum tank30 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can congo tetras live with dwarf neon rainbowfish?

Yes. Congo tetras and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 30 gal.

What temperature suits both congo tetras and dwarf neon rainbowfish?

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

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

At least 30 gal, set by the congo tetra. Add space for each extra fish.