What is this limpet looking thing?

[FatDragon]

Noticed this little guy on one of my rocks, have no clue how it got into my tank. It looks kinda like an abalone with one touch shell and everything bellow is just flesh. Should I keep it in my tank or remove it?

 

[WheatToast]

This is a Stomatella snail, a beneficial algae-grazing snail. Definitely a keeper.

 

[FatDragon]

This is a Stomatella snail, a beneficial algae-grazing snail. Definitely a keeper.

Awesome, thank you!