Can Molly and Ranchu Goldfish live together?

Molly and Ranchu Goldfish are not compatible. The comparison on this page runs the same compatibility engine as the tank builder, checking temperature and pH overlap, predation by size, temperament, and known hard-pair conflicts.

Species Comparison

Molly vs Ranchu Goldfish

Molly

Poecilia sphenops

Ranchu Goldfish

Carassius auratus var. ranchu

Verdict:Not compatible

Side-by-side specs

Livebearers

Family

Goldfish

4″

Adult size

7″

20gal

Min tank

30gal

72–82°F

Temperature

65–75°F

7.5–8.5

6.5–8

peaceful

Temperament

peaceful

Schooling

Solitary

mid

Water level

mid

Compatibility notes

warnMolly and Ranchu Goldfish only narrowly overlap in temperature — keep within 72–75°F.
criticalRanchu Goldfish produces heavy waste and needs cool water — Molly won't tolerate sharing a tank.

Try both in the builder →Compare different species