Can corydoras live with fancy goldfish?

Verdict
No

No. Corydoras and fancy goldfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); corydoras need 72–79°F. They overlap only at 72–74°F, the edge of both ranges.

CorydorasCorydoras72–79°F · pH 6–7.8 Fancy goldfishFancy goldfish65–74°F · pH 7–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–74°Corydoras 72–79°Fancy goldfish 65–74°
The green band is the temperature range both can live in.
456789Both: 7–7.8Corydoras 6–7.8Fancy goldfish 7–8
The green band is the pH both tolerate.

Size to scale

Corydoras · 2.5 inFancy goldfish · 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

CorydorasFancy goldfish
Temperature72–79 °F65–74 °F
pH6–7.87–8
Adult size2.5 in6.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulPeaceful
Swims atBottomAll levels
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for corydoras

All corydoras tank mates

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Questions

Can corydoras live with fancy goldfish?

No. Corydoras and fancy goldfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); corydoras need 72–79°F. They overlap only at 72–74°F, the edge of both ranges.

What temperature suits both corydoras and fancy goldfish?

72–74 °F. Corydoras need 72–79 °F, fancy goldfish need 65–74 °F.

What size tank do corydoras and fancy goldfish need together?

At least 30 gal, set by the fancy goldfish. Add space for each extra fish.