Can silver dollars live with tinfoil barbs?

Verdict
Yes

Yes. Silver dollars and tinfoil barbs make a good pair. Both are fine at 75–80°F. Plan on at least 125 gal.

Silver dollarSilver dollar75–82°F · pH 5–7 Tinfoil barbTinfoil barb72–80°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Silver dollar 75–82°Tinfoil barb 72–80°
The green band is the temperature range both can live in.
456789Both: 6.5–7Silver dollar 5–7Tinfoil barb 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Silver dollar · 6 inTinfoil barb · 12 in0"2"4"6"8"10"12"
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 dollarTinfoil barb
Temperature75–82 °F72–80 °F
pH5–76.5–7.5
Adult size6.0 in12.0 in
Minimum tank75 gal125 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 5+Groups of 5+
DietHerbivoreOmnivore

Better tank mates for silver dollars

All silver dollar tank mates

Better tank mates for tinfoil barbs

All tinfoil barb tank mates

Questions

Can silver dollars live with tinfoil barbs?

Yes. Silver dollars and tinfoil barbs make a good pair. Both are fine at 75–80°F. Plan on at least 125 gal.

What temperature suits both silver dollars and tinfoil barbs?

75–80 °F. Silver dollars need 75–82 °F, tinfoil barbs need 72–80 °F.

What size tank do silver dollars and tinfoil barbs need together?

At least 125 gal, set by the tinfoil barb. Add space for each extra fish.