This one looks like a nudi.
my stomatellas don't have the feelers either:A Stomatella snail perhaps?
wow, looks like it is. http://www.practicalcoralfarming.com/zoonudis.html Didn't know that. I had only heard "dip and pick before".So this is the answer to the problem?
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=16551