Can mystery snails live with upside down catfish?

Verdict
Yes

Yes. Mystery snails and upside down catfish make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

Mystery snailMystery snail68–82°F · pH 7–8 Upside down catfishUpside down catfish72–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Mystery snail 68–82°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 7–7.5Mystery snail 7–8Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Mystery snail · 2 inUpside down catfish · 4 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 snailUpside down catfish
Temperature68–82 °F72–79 °F
pH7–86–7.5
Adult size2.0 in4.0 in
Minimum tank5 gal30 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupAlone or in pairsGroups of 3+
DietOmnivoreOmnivore

Better tank mates for mystery snails

All mystery snail tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can mystery snails live with upside down catfish?

Yes. Mystery snails and upside down catfish make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both mystery snails and upside down catfish?

72–79 °F. Mystery snails need 68–82 °F, upside down catfish need 72–79 °F.

What size tank do mystery snails and upside down catfish need together?

At least 30 gal, set by the upside down catfish. Add space for each extra fish.