Was doing some after lights out observation when I saw this. Definitely didn't add this snail intentionally. I have no idea how long he's been in there but probably a very long time. Has to be nocturnal because I've never seen him before.
That's what I was thinking @KJ . I just hadn't seen one with the striped proboscis before. Should followed my gut and grabbed him for the sump when I spotted him. Time for another nocturnal surveillance!