Can you pick them up to inspect them? I believe that pyramid snails attack primarily thru the foot.
Also - do you by chance have another tank you could move the unaffected (as of yet) clams to until you figure this out? They are very nice looking and I'd hate to see you lose them!
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Current Tank Info: 120 mixed reef with 40b sump, RO 150 skimmer, AI Sol Blue x 2, and a 60g Frag Tank with 100g rubbermaid sump. 2 x Kessil A360w lights, BM curve 5 skimmer
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