Can rummy nose tetras live with silver dollars?

Verdict
Yes

Yes. Rummy nose tetras and silver dollars make a good pair. Both are fine at 75–82°F. Plan on at least 75 gal.

Rummy nose tetraRummy nose tetra75–84°F · pH 5.5–7 Silver dollarSilver dollar75–82°F · pH 5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Rummy nose tetra 75–84°Silver dollar 75–82°
The green band is the temperature range both can live in.
456789Both: 5.5–7Rummy nose tetra 5.5–7Silver dollar 5–7
The green band is the pH both tolerate.

Size to scale

Rummy nose tetra · 2 inSilver dollar · 6 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

Rummy nose tetraSilver dollar
Temperature75–84 °F75–82 °F
pH5.5–75–7
Adult size2.0 in6.0 in
Minimum tank20 gal75 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 5+
DietOmnivoreHerbivore

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can rummy nose tetras live with silver dollars?

Yes. Rummy nose tetras and silver dollars make a good pair. Both are fine at 75–82°F. Plan on at least 75 gal.

What temperature suits both rummy nose tetras and silver dollars?

75–82 °F. Rummy nose tetras need 75–84 °F, silver dollars need 75–82 °F.

What size tank do rummy nose tetras and silver dollars need together?

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