Can mollies live with boesemani rainbowfish?

Verdict
Yes

Yes. Mollies and boesemani rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 30 gal.

MollyMolly72–82°F · pH 7.5–8.5 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Molly 72–82°Boesemani rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 7.5–8Molly 7.5–8.5Boesemani rainbowfish 7–8
The green band is the pH both tolerate.

Size to scale

Molly · 4 inBoesemani rainbowfish · 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

MollyBoesemani rainbowfish
Temperature72–82 °F75–82 °F
pH7.5–8.57–8
Adult size4.0 in4.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for mollies

All molly tank mates

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can mollies live with boesemani rainbowfish?

Yes. Mollies and boesemani rainbowfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 30 gal.

What temperature suits both mollies and boesemani rainbowfish?

75–82 °F. Mollies need 72–82 °F, boesemani rainbowfish need 75–82 °F.

What size tank do mollies and boesemani rainbowfish need together?

At least 30 gal, set by the boesemani rainbowfish. Add space for each extra fish.