1) they eat nerites and mystery snails too... Or at least kill them and eat PART of them. my assassins killed japanese trapdoor snails which were at least 3 times larger than them.

Can you put Nerite snails with Assassin snails?

But even snails with an operculum, like Trumpet Snails, are no match for a hungry Assassin Snail. ... With other snails like mature Mystery Snails, Japanese Trapdoor Snails, Nerite Snails, Rabbit Snails, Gold Inca Snails and Ivory Snails, if prey is larger than predator, then prey is generally safe.

What do assassins snails eat?

But what happens when the assassin snail has eaten all of the other snails in a tank? Luckily, it is able to subsist on other food. It will take fish food like flakes, pellets and algae chips, as well as graze on algae and biofilm.