"Invested/reverse" Trochus snail

[Bento]

Hello,
Today I was cleaning my tank and found a Trochus snail I that I hadn't seen for awhile and assumed he had been eaten.
I didn't pay much attention after that until I was looking in tonight and noticed the snail is upside down in its shell (It moves on its shell instead of the substrate). Has anyone else experienced this? All my other are fine just this one.

 

[fishguy242]

hi just help him right himself ,prob just in a position ,cannot ,happy reefing

 

[Bento]

Thanks for that, I had helped a few times but kept changing back and it looked strange last night. I flipped him again and seems to be fine this time ‍. Thanks for your help