are Stomatella Varia reef safe??

[Namscam]

Ok after constantly looking at my tank to see what kind of goodies came with my rock because it seems like everyone's tank is full of surprise, I have finally found a hitch hiker ...wooo whooo....after some research I believe I have a few Stomatella Varia in my tank...are these lil gastropods good or bad? for those of you that dont know what they are, heres a like to it because I was too lazy to get the camera out http://www.reefs.org/hhfaq/pages/pic...tomatella.html

[Aquattro]

they're good.