Can congo tetras live with silver dollars?

Verdict
Yes

Yes, congo tetras and silver dollars can live together. Both are fine at 75–82°F. Plan on at least 75 gal.

Congo tetraCongo tetra73–82°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: 75–82°Congo tetra 73–82°Silver dollar 75–82°
The green band is the temperature range both can live in.
456789Both: 6–7Congo tetra 6–7.5Silver dollar 5–7
The green band is the pH both tolerate.

Size to scale

Congo tetra · 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

Congo tetraSilver dollar
Temperature73–82 °F75–82 °F
pH6–7.55–7
Adult size3.0 in6.0 in
Minimum tank30 gal75 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 5+
DietOmnivoreHerbivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can congo tetras live with silver dollars?

Yes, congo tetras and silver dollars can live together. Both are fine at 75–82°F. Plan on at least 75 gal.

What temperature suits both congo tetras and silver dollars?

75–82 °F. Congo tetras need 73–82 °F, silver dollars need 75–82 °F.

What size tank do congo tetras and silver dollars need together?

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