My snail is floating, is he dead?

Question

i have a freshwater tank and a little snail in it, and all of a sudden hes floating at the top of the tank. can someone tell me the signs of a dead snail? he also turned a little white, but this is not the first time he turned white.

so to sum up this question,

How can you tell if your snail is dead?

Will the other fish eat him?/ is it bad for the other fish to eat him?

why is he floating, (if hes not dead)?

&are they nocturnal?

yeah i have alot of questions, but i need to know.

its a matter of life and death!!

[for the snail]

Answer 1

they float so the wind can move them to a better place where food is more plentiful.  

Answer 2

no he is not dead, he is sleeping, they can sleep for days. A dead snail will sink and if you pick it up, all its guts will fall out. Gross. You can test to see if he is dead by pulling on the trap door, if the snail pulls back he is alive, if he does not, he si dea.=(

Answer 3

no he is swimming

Answer 4

I really have no idea in why that snail is even floating, maybe he rant out of sticky glue. Well, i haven't seen Gary float for no reason above the water....