Can fancy goldfish live with apistogramma?

Verdict
No

No. Fancy goldfish and apistogramma should not share a tank. Fancy goldfish are coldwater animals (65–74°F); apistogramma need 75–84°F. No temperature suits both.

What to watch

Water side by side

55°60°65°70°75°80°85°90°Fancy goldfish 65–74°Apistogramma 75–84°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 7Fancy goldfish 7–8Apistogramma 5–7
The green band is the pH both tolerate.

Size to scale

Fancy goldfish · 6 inApistogramma · 3 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 goldfishApistogramma
Temperature65–74 °F75–84 °F
pH7–85–7
Adult size6.0 in3.0 in
Minimum tank30 gal20 gal
TemperamentPeacefulSemi-aggressive
Swims atAll levelsBottom
GroupAlone or in pairsAlone or in pairs
DietOmnivoreCarnivore

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Better tank mates for apistogramma

All apistogramma tank mates

Questions

Can fancy goldfish live with apistogramma?

No. Fancy goldfish and apistogramma should not share a tank. Fancy goldfish are coldwater animals (65–74°F); apistogramma need 75–84°F. No temperature suits both.

What temperature suits both fancy goldfish and apistogramma?

None. Fancy goldfish need 65–74 °F and apistogramma need 75–84 °F, so the ranges do not meet.

What size tank do fancy goldfish and apistogramma need together?

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