Can fancy goldfish live with assassin snails?

Verdict

No. Fancy goldfish and assassin snails should not share a tank. Fancy goldfish are coldwater animals (65–74°F); assassin snails need 75–80°F. No temperature suits both.

Fancy goldfish65–74°F · pH 7–8

Assassin snail75–80°F · pH 7–8

What to watch

Deal breakerFancy goldfish are coldwater animals (65–74°F); assassin snails need 75–80°F. No temperature suits both.
Watch outLarge fancy goldfish crack or pick at small snails. A big mystery snail has better odds than a ramshorn.

What works

pH 7–8 suits both.

Water side by side

The ranges do not meet, so one of them would always be too warm or too cold.

The green band is the pH both tolerate.

Size to scale

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 goldfish	Assassin snail
Temperature	65–74 °F	75–80 °F
pH	7–8	7–8
Adult size	6.0 in	1.0 in
Minimum tank	30 gal	5 gal
Temperament	Peaceful	Peaceful
Swims at	All levels	Bottom
Group	Alone or in pairs	Alone or in pairs
Diet	Omnivore	Carnivore

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Better tank mates for assassin snails

All assassin snail tank mates

Questions

Can fancy goldfish live with assassin snails?

No. Fancy goldfish and assassin snails should not share a tank. Fancy goldfish are coldwater animals (65–74°F); assassin snails need 75–80°F. No temperature suits both.

What temperature suits both fancy goldfish and assassin snails?

None. Fancy goldfish need 65–74 °F and assassin snails need 75–80 °F, so the ranges do not meet.

What size tank do fancy goldfish and assassin snails need together?

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