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And after it fallen it stays in his shell for the complet day. That's normal? Its not even moving on the glass since i took the picture. It use to move around a lot.
sometimes they move right away sometimes they stay still. I've had snails stay still for several days, then just out of the blue start moving. Is he slumped out of his shell? If not he's probably fine.
Test your water. Nerites are sensitive. I'd do a PWC even if my tests look good. Are other inverts acting fine ?
What are you feeding him ?
I had a Nerite starve because he'd eaten ALL the algae and I didn't realize he needed food.
Mine wont eat wafers. You can grow algae on smooth rocks in a tray of water in the sun. And supplement if needed.