Can pictus catfish live with assassin snails?

Verdict
Yes

Yes. Pictus catfish and assassin snails get along in the same tank. Both are fine at 75–79°F. Plan on at least 55 gal.

Pictus catfishPictus catfish72–79°F · pH 6–7.5 Assassin snailAssassin snail75–80°F · pH 7–8

Why it works

Water side by side

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

Size to scale

Pictus catfish · 5 inAssassin snail · 1 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

Pictus catfishAssassin snail
Temperature72–79 °F75–80 °F
pH6–7.57–8
Adult size5.0 in1.0 in
Minimum tank55 gal5 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomBottom
GroupGroups of 3+Alone or in pairs
DietCarnivoreCarnivore

Better tank mates for pictus catfish

All pictus catfish tank mates

Better tank mates for assassin snails

All assassin snail tank mates

Questions

Can pictus catfish live with assassin snails?

Yes. Pictus catfish and assassin snails get along in the same tank. Both are fine at 75–79°F. Plan on at least 55 gal.

What temperature suits both pictus catfish and assassin snails?

75–79 °F. Pictus catfish need 72–79 °F, assassin snails need 75–80 °F.

What size tank do pictus catfish and assassin snails need together?

At least 55 gal, set by the pictus catfish. Add space for each extra fish.