Can guppies live with dwarf neon rainbowfish?

Verdict
Yes

Yes, guppies and dwarf neon rainbowfish can live together. Both are fine at 75–82°F. Plan on at least 20 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 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°Guppy 72–82°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.8–7.5Guppy 6.8–7.8Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Guppy · 2 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

GuppyDwarf neon rainbowfish
Temperature72–82 °F75–82 °F
pH6.8–7.86.5–7.5
Adult size2.0 in2.5 in
Minimum tank10 gal20 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can guppies live with dwarf neon rainbowfish?

Yes, guppies and dwarf neon rainbowfish can live together. Both are fine at 75–82°F. Plan on at least 20 gal.

What temperature suits both guppies and dwarf neon rainbowfish?

75–82 °F. Guppies need 72–82 °F, dwarf neon rainbowfish need 75–82 °F.

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

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