Can mystery snails live with pencilfish?

Verdict
Yes

Yes. Mystery snails and pencilfish make a good pair. Both are fine at 75–82°F. Plan on at least 15 gal.

Mystery snailMystery snail68–82°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: 75–82°Mystery snail 68–82°Pencilfish 75–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Mystery snail 7–8Pencilfish 5–7.5
The green band is the pH both tolerate.

Size to scale

Mystery snail · 2 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

Mystery snailPencilfish
Temperature68–82 °F75–82 °F
pH7–85–7.5
Adult size2.0 in2.0 in
Minimum tank5 gal15 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for mystery snails

All mystery snail tank mates

Better tank mates for pencilfish

All pencilfish tank mates

Questions

Can mystery snails live with pencilfish?

Yes. Mystery snails and pencilfish make a good pair. Both are fine at 75–82°F. Plan on at least 15 gal.

What temperature suits both mystery snails and pencilfish?

75–82 °F. Mystery snails need 68–82 °F, pencilfish need 75–82 °F.

What size tank do mystery snails and pencilfish need together?

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