Minh, an update:
My clams had been showing symptoms for about 2 weeks (3" maxima and 2" squamosa), starting with slightly uneven mantle edges then the mantle became more and more pinched. Until a few days ago i thought i had pyramellid (sp?) snails and was checking the clams every night to no avail.
Last night i dipped both clams for 25 minutes in about 80% DI water, 20% saltwater, same temp. as the tank. (thought this might be less stressful)
After the dip the squamosa started to gape a little but is fine today. Today both clams are fully open and show no signs of pinching.
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