sundial maybe?
http://www.coralrx.com/index.php?opt...d=18&Itemid=16
http://www.saltyunderground.com/arti...articles_id=51

snail
 

Nope, doesn't look like a sundial. The shell is identical in shape to a bumblebee snail

zoanthids are notorious for doing this without any reason. They can do it if the alkalinity swing too much, the ORP swing too much, etc...

I once put Kent "iron and magnaneese" in my tank with the recommanded dosage and some of my zoanthids instantly shriveled and they died in a day or two after that.

So no more dosing for me, except by the drop to make sure things are in normal quantity.

I dose vitamine C for many months now and it does help to reduce those melting episode.

Checkered shell sure does sound like a sundial snail and they do eat zoanthids.
http://www.melevsreef.com/pics/0705/sundial_tattoo.jpg

Could possibly be a eucinid worm, never saw it until I ripped down the tank but he ate Zoas and rics.

snail
 

Its definatly not a sundial because it looks nothing like that, and the zoas didn't shrivel it was in 2-3 hours they dissapeared. The snail has a similar pattern to the sundial shell but looks like a bumblebee snail. I'm starting to think it was the pods though because they have been bugging my peanut butter zoas as well. Tonight ill snap a pic of the snail and see if someone can I d it. If I can find it.

Looks like my wrasse has either gotten them under control, or they are scared as crap to come out..lol The radioactive dragon eyes are actually open as of yesterday, and that was just one day!!!

i bet you have a decorator crab! lmao! i had 20 heads of beautiful magicians! went to bed, woke up.. all but 3 gone.. two days later an hour after lights out with just my moons on my decorator crab came out and yup... he was wearing my beautiful palys... still is a month later!