Can discus live with mollies?

Verdict
Yes, with care

Yes, with care. Discus and mollies can share a tank, but watch one thing. They only share 82°F. Keep the heater set there and steady.

DiscusDiscus82–88°F · pH 5.5–7 MollyMolly72–82°F · pH 7.5–8.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 82°Discus 82–88°Molly 72–82°
The green band is the temperature range both can live in.
456789Discus 5.5–7Molly 7.5–8.5
No pH suits both. One would live in the wrong water all the time.

Size to scale

Discus · 6 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

DiscusMolly
Temperature82–88 °F72–82 °F
pH5.5–77.5–8.5
Adult size6.0 in4.0 in
Minimum tank55 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 5+Groups of 3+
DietCarnivoreOmnivore

Better tank mates for discus

All discus tank mates

Better tank mates for mollies

All molly tank mates

Questions

Can discus live with mollies?

Yes, with care. Discus and mollies can share a tank, but watch one thing. They only share 82°F. Keep the heater set there and steady.

What temperature suits both discus and mollies?

82–82 °F. Discus need 82–88 °F, mollies need 72–82 °F.

What size tank do discus and mollies need together?

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