Nerite Snail - Is it dead or alive???

[hyun007]

I have a Nerite Snail that have not been moving in the tank for the past few days.
I try to look in the inside and there is still fresh inside and it is not smelly.
A dead snail is smelly and the dead fresh will usually drop out.

What is wrong with it or is it really dead?

Is it because it is not getting brackish water?
Water parameter is fine and the trumpet snail, ramhorn and pond snail are booming which I am having a hard time getting rid of them.

[hyun007]

Okay, it is confirm dead.
It does smell today.

Kind of weired that it was fine for quite a few days and then just died.
Other snails were thriving like crazy.