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I will have to do research on these. From what I have found so far, these are typically clam predators. There have been a few reports of some types of pyramid snails that go after astrea snails. From what I have read, the best course of action is to knock off the adults and use a brush to remove any eggs. Without a host, they cannot survive. With a clam, you would need to remove the clam to another tank and wait for the snails to die off. I will not be able to remove all of the snails, so I will have to pick them out, and brush them off. One by one.