Can silver dollars live with yellow labs?

Verdict
No

No. Silver dollars and yellow labs should not share a tank. Different water: silver dollars want pH 5–7, yellow labs want pH 7.8–8.6.

Silver dollarSilver dollar75–82°F · pH 5–7 Electric yellow cichlidElectric yellow cichlid75–82°F · pH 7.8–8.6

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Silver dollar 75–82°Electric yellow cichlid 75–82°
The green band is the temperature range both can live in.
456789Silver dollar 5–7Electric yellow cichlid 7.8–8.6
No pH suits both. One would live in the wrong water all the time.

Size to scale

Silver dollar · 6 inElectric yellow cichlid · 4 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 dollarElectric yellow cichlid
Temperature75–82 °F75–82 °F
pH5–77.8–8.6
Adult size6.0 in4.0 in
Minimum tank75 gal40 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleAll levels
GroupGroups of 5+Groups of 4+
DietHerbivoreOmnivore

Better tank mates for silver dollars

All silver dollar tank mates

Better tank mates for yellow labs

All electric yellow cichlid tank mates

Questions

Can silver dollars live with yellow labs?

No. Silver dollars and yellow labs should not share a tank. Different water: silver dollars want pH 5–7, yellow labs want pH 7.8–8.6.

What temperature suits both silver dollars and yellow labs?

75–82 °F. Silver dollars need 75–82 °F, yellow labs need 75–82 °F.

What size tank do silver dollars and yellow labs need together?

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