Can rams live with mollies?

Verdict
Yes, with care

Yes, with care. Rams and mollies can share a tank, but watch one thing. Different water: rams want pH 5–7, mollies want pH 7.5–8.5.

German blue ramGerman blue ram80–86°F · pH 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: 80–82°German blue ram 80–86°Molly 72–82°
The green band is the temperature range both can live in.
456789German blue ram 5–7Molly 7.5–8.5
No pH suits both. One would live in the wrong water all the time.

Size to scale

German blue ram · 2.5 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

German blue ramMolly
Temperature80–86 °F72–82 °F
pH5–77.5–8.5
Adult size2.5 in4.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupAlone or in pairsGroups of 3+
DietOmnivoreOmnivore

Better tank mates for rams

All german blue ram tank mates

Better tank mates for mollies

All molly tank mates

Questions

Can rams live with mollies?

Yes, with care. Rams and mollies can share a tank, but watch one thing. Different water: rams want pH 5–7, mollies want pH 7.5–8.5.

What temperature suits both rams and mollies?

80–82 °F. Rams need 80–86 °F, mollies need 72–82 °F.

What size tank do rams and mollies need together?

At least 20 gal, set by the german blue ram. Add space for each extra fish.