Can tiger barbs live with silver dollars?

Verdict
Yes

Yes, tiger barbs and silver dollars can live together. Both are fine at 75–81°F. Plan on at least 75 gal.

Tiger barbTiger barb72–81°F · pH 6–7.5 Silver dollarSilver dollar75–82°F · pH 5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Tiger barb 72–81°Silver dollar 75–82°
The green band is the temperature range both can live in.
456789Both: 6–7Tiger barb 6–7.5Silver dollar 5–7
The green band is the pH both tolerate.

Size to scale

Tiger barb · 3 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

Tiger barbSilver dollar
Temperature72–81 °F75–82 °F
pH6–7.55–7
Adult size3.0 in6.0 in
Minimum tank30 gal75 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 5+
DietOmnivoreHerbivore

Better tank mates for tiger barbs

All tiger barb tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can tiger barbs live with silver dollars?

Yes, tiger barbs and silver dollars can live together. Both are fine at 75–81°F. Plan on at least 75 gal.

What temperature suits both tiger barbs and silver dollars?

75–81 °F. Tiger barbs need 72–81 °F, silver dollars need 75–82 °F.

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

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