I'm new to owning snails so I'm not sure what the acclimation time is for nerites, but I'm pretty sure I was sold a dead nerite snail? When I picked out the little guy I asked the one that was clearly active, out of its shell, and climbing the glass. I turned around for a minute to look in another tank for a new fish, and I think they may have picked up a different nerite. The shell pattern doesn't quiet look the same. Anyway, I took the little guy home last sunday and, now six days later, he has not moved or come out of his shell at all. Is it possible that I was either sold a dead snail or that maybe it died soon after coming home?... Is it possibly just an extremely scare snail?