I would have a hard time believing a snail ate a xenia stalk as well. I guess anything is possible in this world, but odds are, the snail crept over it, it shrivelled up to almost nothing. I don't know. Hard to visualize what happened by reading this thread. It could have been knocked off the rock and onto the sand bed also. I have had that happen, where a hermit or snail and dislodged a small frag and it went tumbling in the current.