Can assassin snails live with boesemani rainbowfish?

Verdict
Yes

Yes. Assassin snails and boesemani rainbowfish make a good pair. Both are fine at 75–80°F. Plan on at least 30 gal.

Assassin snailAssassin snail75–80°F · pH 7–8 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

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

Size to scale

Assassin snail · 1 inBoesemani rainbowfish · 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

Assassin snailBoesemani rainbowfish
Temperature75–80 °F75–82 °F
pH7–87–8
Adult size1.0 in4.0 in
Minimum tank5 gal30 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for assassin snails

All assassin snail tank mates

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can assassin snails live with boesemani rainbowfish?

Yes. Assassin snails and boesemani rainbowfish make a good pair. Both are fine at 75–80°F. Plan on at least 30 gal.

What temperature suits both assassin snails and boesemani rainbowfish?

75–80 °F. Assassin snails need 75–80 °F, boesemani rainbowfish need 75–82 °F.

What size tank do assassin snails and boesemani rainbowfish need together?

At least 30 gal, set by the boesemani rainbowfish. Add space for each extra fish.