Clam fresh water dip

[turkleton]

It's the first clam I have ever purchased, and it was doing great for a few weeks, but a few days ago I noticed that the mantle was looking pinched. I checked it over and I did find a few pyramid snails. I removed those and have not seen any more for a couple days but the clam still looks unhappy. I was going to wait a few more more days and if the clam doesn't appear to improve, and I don't find any more snails, I was going to dip it. And yes this will be the first time I have tried this