How do you know if a snail is dead? There are three turbo snails in the tank, one is mowing away, one has not moved and cannot see any of his body from the view I have and the other one has moved a tiny spot and can see is body but no real activity for the morning. How do you know if there is a problem with them. Water parameters are Ammonia 0, Nitrites 0, Nitrates 12, salinity 1.022 and temp 74.5. Thanks