Yep, speedy is the trademark for Stomatella snails. The most common species in reef tanks seem to be Stomatella impertusa and Stomatella varia (which are very similar). I may be tricked by the photo angle, but the anterior edge of your snail's shell looks overly broad for those species. If it's neither of those I mentioned, it's either Stomatella planata or one of the other, broader, species in the genus. It should be a nice guy in your tank.
I hope the snail in the background (near the top) of your second pic is housing a hermit crab, he's NOT a nice guy.
Cheers,
Don