This is a very experimental subject, sorta like bettas with shrimp; the could eat them, they could care less. Nerite snails are a little harder for assassins to kill tho (but not impossible). They're anatomy angle and operculum prove to be a challenge to the assassin. Some have tanks with both and they're fine, some have had nerite deaths (even when they were so much bigger). So therefore, monitor your tanks. If any suspicious number go missing, take the nerites or assassin (if found) out.