Can severums live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Severums and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 55 gal.

SeverumSeverum74–84°F · pH 6–7 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°Severum 74–84°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7Severum 6–7Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Severum · 8 inDwarf neon rainbowfish · 2.5 in0"1"2"3"4"5"6"7"8"
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

SeverumDwarf neon rainbowfish
Temperature74–84 °F75–82 °F
pH6–76.5–7.5
Adult size8.0 in2.5 in
Minimum tank55 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for severums

All severum tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can severums live with dwarf neon rainbowfish?

Yes. Severums and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 55 gal.

What temperature suits both severums and dwarf neon rainbowfish?

75–82 °F. Severums need 74–84 °F, dwarf neon rainbowfish need 75–82 °F.

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

At least 55 gal, set by the severum. Add space for each extra fish.