Thanks Ted. Going by that they should have lived. I seldom saw the eat
anything and they weren't very active. They ignored algae wafers. *I stopped
buying them.

Apple snails have the nice feature of being an indicator of certain
water problems. In particular, if they're uncomfortable they'll seal
up inside their shells. They can do this days before the water is too
bad for fish.

So, if you saw them recoil inside their shells very often, maybe there
was something else wrong with tank other than food. ? Other than
that, maybe it was the fish store (or their source).

--Ted