Can guppies live with mollies?

Verdict
Yes

Yes, guppies and mollies can live together. Both are fine at 72–82°F. Plan on at least 20 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 MollyMolly72–82°F · pH 7.5–8.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–82°Guppy 72–82°Molly 72–82°
The green band is the temperature range both can live in.
456789Both: 7.5–7.8Guppy 6.8–7.8Molly 7.5–8.5
The green band is the pH both tolerate.

Size to scale

Guppy · 2 inMolly · 4 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

GuppyMolly
Temperature72–82 °F72–82 °F
pH6.8–7.87.5–8.5
Adult size2.0 in4.0 in
Minimum tank10 gal20 gal
TemperamentPeacefulPeaceful
Swims atTopTop
GroupGroups of 3+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for mollies

All molly tank mates

Questions

Can guppies live with mollies?

Yes, guppies and mollies can live together. Both are fine at 72–82°F. Plan on at least 20 gal.

What temperature suits both guppies and mollies?

72–82 °F. Guppies need 72–82 °F, mollies need 72–82 °F.

What size tank do guppies and mollies need together?

At least 20 gal, set by the molly. Add space for each extra fish.