It'r really difficult to tell from the pic what those things are. If your snails haven't moved and are closed up, I suspect they are already dead. The things in your pic may just be detrivores.
What changes in your tank occurred before the snail problems? Add any meds to the tank? Introduce new livestock, especially snails?
I don't know what else to ask or to tell you. If you had a better pic of the critters, someone may be able to ID them.
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