Can guppies live with neon tetras?

Verdict
Yes

Yes. Guppies and neon tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 10 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 Neon tetraNeon tetra72–79°F · pH 6–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Guppy 72–82°Neon tetra 72–79°
The green band is the temperature range both can live in.
456789Both: 6.8–7Guppy 6.8–7.8Neon tetra 6–7
The green band is the pH both tolerate.

Size to scale

Guppy · 2 inNeon tetra · 1.5 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

GuppyNeon tetra
Temperature72–82 °F72–79 °F
pH6.8–7.86–7
Adult size2.0 in1.5 in
Minimum tank10 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for neon tetras

All neon tetra tank mates

Questions

Can guppies live with neon tetras?

Yes. Guppies and neon tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 10 gal.

What temperature suits both guppies and neon tetras?

72–79 °F. Guppies need 72–82 °F, neon tetras need 72–79 °F.

What size tank do guppies and neon tetras need together?

At least 10 gal, set by the guppy. Add space for each extra fish.