Can guppies live with glowlight tetras?

Verdict
Yes

Yes. Guppies and glowlight tetras get along in the same tank. Both are fine at 74–80°F. Plan on at least 10 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 Glowlight tetraGlowlight tetra74–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–80°Guppy 72–82°Glowlight tetra 74–80°
The green band is the temperature range both can live in.
456789Both: 6.8–7.5Guppy 6.8–7.8Glowlight tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Guppy · 2 inGlowlight 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

GuppyGlowlight tetra
Temperature72–82 °F74–80 °F
pH6.8–7.86–7.5
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 glowlight tetras

All glowlight tetra tank mates

Questions

Can guppies live with glowlight tetras?

Yes. Guppies and glowlight tetras get along in the same tank. Both are fine at 74–80°F. Plan on at least 10 gal.

What temperature suits both guppies and glowlight tetras?

74–80 °F. Guppies need 72–82 °F, glowlight tetras need 74–80 °F.

What size tank do guppies and glowlight tetras need together?

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