yeah...its a REALLY nasty stinky smell, like it'll make me gag. Mine sometimes seem to have stayed in one place for SO long (like a week at a time) yet they're fine...
I clean the snail tank out at my lfs...on average there is like 2 dead snails every week, but even when i do water changes, It doesnt half stink i am always nearly sick when i clean it out*SICK*
well i cleaned out the tank yesterday and this brown songy jelly like thing came out of the shell so i think it is dead lol luckily though i still have my big one around.