Whoa! Really old thread, Sam
I did a series of videos on catching an Oenone worm. The worm we fianlly caught wasn't what we thought we had. Here's the video of the worm we caught...
http://www.lostmymarblz.com/v-120g-b...-apr-29-06.wmv
April 29, 2006
(320 x 240 pixels, 7.1 MB, 2:18 minutes)
Read Dr. Ron Shimek's Reefkeeping Magazine's article, "The Large Worm Turns"...
http://www.reefkeeping.com/issues/2003-04/rs/index.php
As it turned out, we had a bunch of other snail deaths in August 2006. Probably a snail or two a week died for about a month or so, always in the same part of the tank. Was really distressed about the deaths, since we thought we'd caught our snail eater. We did nothing about the deaths, except remove the dead snails. Then, no more snail deaths. Stumped me to no end.
The only two things I can think that may have happened are that our solarensis fairy wrasse wasn't getting his daily scallop any more and he/she may have been killing or eating fallen snails, or that the snails had been in our various tanks over the years, were old and simply died. Or maybe a combination of the two.
Anyway, haven't had a snail death since then.
Hopefully you have IDed the culprit, the zebra hermit, in your snail deaths. We haven't kept hermit crabs since our first tank back in the late 90s.