Can fancy goldfish live with boesemani rainbowfish?

Verdict
No

No. Fancy goldfish and boesemani rainbowfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); boesemani rainbowfish need 75–82°F. No temperature suits both.

Fancy goldfishFancy goldfish65–74°F · pH 7–8 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Fancy goldfish 65–74°Boesemani rainbowfish 75–82°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 7–8Fancy goldfish 7–8Boesemani rainbowfish 7–8
The green band is the pH both tolerate.

Size to scale

Fancy goldfish · 6 inBoesemani rainbowfish · 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

Fancy goldfishBoesemani rainbowfish
Temperature65–74 °F75–82 °F
pH7–87–8
Adult size6.0 in4.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulPeaceful
Swims atAll levelsMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can fancy goldfish live with boesemani rainbowfish?

No. Fancy goldfish and boesemani rainbowfish should not share a tank. Fancy goldfish are coldwater animals (65–74°F); boesemani rainbowfish need 75–82°F. No temperature suits both.

What temperature suits both fancy goldfish and boesemani rainbowfish?

None. Fancy goldfish need 65–74 °F and boesemani rainbowfish need 75–82 °F, so the ranges do not meet.

What size tank do fancy goldfish and boesemani rainbowfish need together?

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