Could you tell us what type of snails? There are some predatory snails, and are there just copepods on the clams. etc.? There are also predatory "bugs" that can eat away and eliminate clams and the like.
Could it be your tanks conditions? The water flow? Anything particular about that spot in the tank? A little more info may help us out, and of course definitely see if there are any "hitchhikers" that are mysteriously running around your tank.
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If you put "u" instead of typing out the actual, shocking, three letter word... i'm not going to read your ramblings.
I'm so behind it's not even funny.
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