Help identifying a possible hitchhiker

[pandaparties]

So I noticed a new slug/snail in my tank that I most certainly have never seen. I haven't bought any new coral or rock in the past few months so I was surprised to see this. It almost looked like it could be a baby forming it's shell but I've never seen a baby snail so I have no clue. Any help would be great! Don't want to remove it but also don't want to leave an unidentified hiker in my tank, especially since some of my zoa's and other lps started closing up recently.

 

[Alexopora]

Stomatella snail. It is harmless and beneficial for your tank. They consume algae.