I moved my 30 gal tank last weekend. Everything is fine and the inhabitants are happy but I have a snail that has been in it's shell since then, like 5 days now. It's not sticking out at all, it's completely sucked in, so at first i didn't think it was dead. It's been a while and i'm a bit concerned. I took it out to look at it and it smelled bad, but i dunno if that was normal, never smelled it before. It also seems like the shell is becoming discolored.