Can ramshorn snails live with pencilfish?

Verdict
Yes

Yes. Ramshorn snails and pencilfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 15 gal.

Ramshorn snailRamshorn snail70–80°F · pH 7–8 PencilfishPencilfish75–82°F · pH 5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Ramshorn snail 70–80°Pencilfish 75–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Ramshorn snail 7–8Pencilfish 5–7.5
The green band is the pH both tolerate.

Size to scale

Ramshorn snail · 1 inPencilfish · 2 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

Ramshorn snailPencilfish
Temperature70–80 °F75–82 °F
pH7–85–7.5
Adult size1.0 in2.0 in
Minimum tank5 gal15 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for ramshorn snails

All ramshorn snail tank mates

Better tank mates for pencilfish

All pencilfish tank mates

Questions

Can ramshorn snails live with pencilfish?

Yes. Ramshorn snails and pencilfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 15 gal.

What temperature suits both ramshorn snails and pencilfish?

75–80 °F. Ramshorn snails need 70–80 °F, pencilfish need 75–82 °F.

What size tank do ramshorn snails and pencilfish need together?

At least 15 gal, set by the pencilfish. Add space for each extra fish.