The Opae ula shrimp Forum and online store

I've been looking at marine Nassarius Vibex snails and spotted a user on instagram who has some happily living in their opea ula tank!?

see: http://www.thepicta.com/media/152363438 ... 4583564826

Has anyone ever come across these snails before?

I have seen Nassarius snails in aquatics stores both in real life and online. They are usually in the marine section.