Don't think so, they actually look like a ninja star, the ones I saw were about 1 inch. Pretty cool looking, but like I said without knowing what it does I couldn't add it.
A ninja star snail is of the astraea species and comes from the indo-pacific region (at least the one I bought does). It eats algae (diatoms and micro-algae) off the glass and rocks and is peaceful just like others of similar species and grows to about 2 inches. It can't turn itself over if it lands upsidedown but they do have a really cool shaped shell.