Can guppies live with fancy goldfish?

Verdict
No

No. Guppies and fancy goldfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); guppies need 72–82°F. They overlap only at 72–74°F, the edge of both ranges.

GuppyGuppy72–82°F · pH 6.8–7.8 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°Guppy 72–82°Fancy goldfish 65–74°
The green band is the temperature range both can live in.
456789Both: 7–7.8Guppy 6.8–7.8Fancy goldfish 7–8
The green band is the pH both tolerate.

Size to scale

Guppy · 2 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

GuppyFancy goldfish
Temperature72–82 °F65–74 °F
pH6.8–7.87–8
Adult size2.0 in6.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atTopAll levels
GroupGroups of 3+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Questions

Can guppies live with fancy goldfish?

No. Guppies and fancy goldfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); guppies need 72–82°F. They overlap only at 72–74°F, the edge of both ranges.

What temperature suits both guppies and fancy goldfish?

72–74 °F. Guppies need 72–82 °F, fancy goldfish need 65–74 °F.

What size tank do guppies and fancy goldfish need together?

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