Should I worry about flipped snails?

[fisherdonk]

I have many snails in my CUC. A couple of the larger ones (I forget their genus) I often find on their back on the sand bed. I believe this to be a result of them climbing up the glass then falling (though I have not seen them). However all my other snails climb up the glass fine and none end up in the same position.

Should I be worried? Should I flip them over (I tried but this happened again)?
Incidentally, how would I know if they were dead?

He's the larger one in the middle. I can get a better pic but didn't want to disturb the corals with lighting.

 

[fishguy242]

hi, yes always flip them, will die if not uprighted.
place on rock/ up against glass.