Can serpae tetras live with silver dollars?

Verdict
Yes

Yes. Serpae tetras and silver dollars make a good pair. Both are fine at 75–79°F. Plan on at least 75 gal.

Serpae tetraSerpae tetra72–79°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: 75–79°Serpae tetra 72–79°Silver dollar 75–82°
The green band is the temperature range both can live in.
456789Both: 6–7Serpae tetra 6–7.5Silver dollar 5–7
The green band is the pH both tolerate.

Size to scale

Serpae tetra · 1.75 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

Serpae tetraSilver dollar
Temperature72–79 °F75–82 °F
pH6–7.55–7
Adult size1.75 in6.0 in
Minimum tank20 gal75 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 5+
DietOmnivoreHerbivore

Better tank mates for serpae tetras

All serpae tetra tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can serpae tetras live with silver dollars?

Yes. Serpae tetras and silver dollars make a good pair. Both are fine at 75–79°F. Plan on at least 75 gal.

What temperature suits both serpae tetras and silver dollars?

75–79 °F. Serpae tetras need 72–79 °F, silver dollars need 75–82 °F.

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

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