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I totally believe (without too much science) that new clams can make older clams die, but not too fast, IME. Tahitian Maximas used to be know for being clam killers over several months.
PM can take a long time to manifest and it is sometimes treatable. This should not make a clam die right away, usually you see signs and then they get better or worse over a month or so.
Running a lot of activated carbon with a new clam can help a lot. It can help with a current PM issue. I would not do a FW dip unless there is nothing else left to do.
Did you see PM on any of the new clams?
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