thanks for your replies,
biff if I knew how to I would circle the thing I'm talking about. it is smack in the center of that photo among the blue zoas. it does look like a frag plug
it doesn't look like pictures i've seen of sundial snails, also my zoas have not bee affected, as much as I can see anyways.
you can't tell from the photo but this thing is very 3 dimensional, it is shaped like a horn on a trumpet