snail troubles

I aquired a small crew of snails (Margarita snails) and they seem to be
having a great deal of trouble getting around on the sub. They tear around
just fine on the glass and LR, but when they are on the bottom (aragonite)
they seem to get hold of one piece of sub, then can't go any further. They
usually roll upside down and then struggle for hours, until I right them
with the feeding stick, or deposit them on the LR. Any comments?

billy
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