Can congo tetras live with assassin snails?

Verdict
Yes

Yes. Congo tetras and assassin snails get along in the same tank. Both are fine at 75–80°F. Plan on at least 30 gal.

Congo tetraCongo tetra73–82°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: 75–80°Congo tetra 73–82°Assassin snail 75–80°
The green band is the temperature range both can live in.
456789Both: 7–7.5Congo tetra 6–7.5Assassin snail 7–8
The green band is the pH both tolerate.

Size to scale

Congo tetra · 3 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

Congo tetraAssassin snail
Temperature73–82 °F75–80 °F
pH6–7.57–8
Adult size3.0 in1.0 in
Minimum tank30 gal5 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for assassin snails

All assassin snail tank mates

Questions

Can congo tetras live with assassin snails?

Yes. Congo tetras and assassin snails get along in the same tank. Both are fine at 75–80°F. Plan on at least 30 gal.

What temperature suits both congo tetras and assassin snails?

75–80 °F. Congo tetras need 73–82 °F, assassin snails need 75–80 °F.

What size tank do congo tetras and assassin snails need together?

At least 30 gal, set by the congo tetra. Add space for each extra fish.