Can silver dollars live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Silver dollars and dwarf neon rainbowfish make a good pair. Both are fine at 75–82°F. Plan on at least 75 gal.

Silver dollarSilver dollar75–82°F · pH 5–7 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Silver dollar 75–82°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7Silver dollar 5–7Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Silver dollar · 6 inDwarf neon rainbowfish · 2.5 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

Silver dollarDwarf neon rainbowfish
Temperature75–82 °F75–82 °F
pH5–76.5–7.5
Adult size6.0 in2.5 in
Minimum tank75 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 5+Groups of 6+
DietHerbivoreOmnivore

Better tank mates for silver dollars

All silver dollar tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can silver dollars live with dwarf neon rainbowfish?

Yes. Silver dollars and dwarf neon rainbowfish make a good pair. Both are fine at 75–82°F. Plan on at least 75 gal.

What temperature suits both silver dollars and dwarf neon rainbowfish?

75–82 °F. Silver dollars need 75–82 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do silver dollars and dwarf neon rainbowfish need together?

At least 75 gal, set by the silver dollar. Add space for each extra fish.