Maybe tank parameters weren't "back to normal" quite yet, I'm not sure. I find when transporting LR there is always a little die off (But I live on the Island so the distance is greater) I would be very nervous putting a large ammount of transported LR in my tank. How much did you add to the tank? That sucks that you lost most of everything. Like you were saying, it makes me wonder if the rock was cured as they said.
When I acclimated my snail's I did a slow drip that took several hours. It worked fine and the only snails I lost were to my stupid blue-leg hermits which started eating them like candy if they fell on the sandbed and got stuck on their backs.
As wayner said, I also have read that invertebrates like a higher SG while fish prefer a lower SG. 1.026 is about what I run my tank at, snails are fine!
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