Odd Nassarius like snail

[Marc G-L]

I picked up some good sized granite nassarius snails from my LFS. In the same tank was this larger dark brown similar snail. It has the same shape and a snorkel. Definitely not an Olive snail. Anybody got an ID? Is it reef safe, or to be relegated to the fuge?

 

[Marc G-L]

Video of snail in question.