There have been murders in my tank!

[moldrik]

Is there a reason why snails do this? I'm pretty sure it has left it's shell since I can't see the bottom of anything like you normally can. Shell looks sparkling clean.

I don't have anything that would do that in the tank. I have two clownfish that have been with the snails for a while now. I added an arrow crab and a kole tang yesterday, but I don't believe that they would have eaten a snail.

Any ideas?