Ok, I might have a kid putting salt in the snail tank (it's up front and up on a shelf making it easier for students to get to), but barring that possibility - all my baby snails died over the weekend. Had one adult die last week, another one looks like its kicking the bucket this week. Put all the others into my bichir tank that I know is safe.
Ammonia - below readable levels
Nitrite - 0ppm
Nitrate - <10ppm
pH - 7.8
Hardness - high
Alkalinity - high
Temp - 76-78F
Calcium source: Shells and limestone
Do you think that maybe the tank is TOO CLEAN? I give them bottom feeder algae waifers, but maybe they need live algae?