Can silver dollars live with hatchetfish?

Verdict
Yes

Yes. Silver dollars and hatchetfish get along in the same tank. Both are fine at 75–81°F. Plan on at least 75 gal.

Silver dollarSilver dollar75–82°F · pH 5–7 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Silver dollar 75–82°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 5.5–7Silver dollar 5–7Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Silver dollar · 6 inHatchetfish · 1.5 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

Silver dollarHatchetfish
Temperature75–82 °F75–81 °F
pH5–75.5–7.5
Adult size6.0 in1.5 in
Minimum tank75 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 5+Groups of 6+
DietHerbivoreCarnivore

Better tank mates for silver dollars

All silver dollar tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can silver dollars live with hatchetfish?

Yes. Silver dollars and hatchetfish get along in the same tank. Both are fine at 75–81°F. Plan on at least 75 gal.

What temperature suits both silver dollars and hatchetfish?

75–81 °F. Silver dollars need 75–82 °F, hatchetfish need 75–81 °F.

What size tank do silver dollars and hatchetfish need together?

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