I've found that it depends on the size of the nerite snail vs the assassin snails, along with the availability of other types of snails in the tank. The assassin snails tend to attack and eat the smaller snails but leave the larger ones alone, i guess its easier to take down smaller prey.
Though if you have a few assassin snails, they may gang up on a larger snail, so there is still a risk there.
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