Can rainbow sharks live with silver dollars?

Verdict
Yes

Yes, rainbow sharks and silver dollars can live together. Both are fine at 75–80°F. Plan on at least 75 gal.

Rainbow sharkRainbow shark72–80°F · pH 6.5–7.5 Silver dollarSilver dollar75–82°F · pH 5–7

Why it works

Water side by side

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

Size to scale

Rainbow shark · 6 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

Rainbow sharkSilver dollar
Temperature72–80 °F75–82 °F
pH6.5–7.55–7
Adult size6.0 in6.0 in
Minimum tank55 gal75 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomMiddle
GroupOne per tankGroups of 5+
DietOmnivoreHerbivore

Better tank mates for rainbow sharks

All rainbow shark tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can rainbow sharks live with silver dollars?

Yes, rainbow sharks and silver dollars can live together. Both are fine at 75–80°F. Plan on at least 75 gal.

What temperature suits both rainbow sharks and silver dollars?

75–80 °F. Rainbow sharks need 72–80 °F, silver dollars need 75–82 °F.

What size tank do rainbow sharks and silver dollars need together?

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