Pinched mantle is a condition caused by protozoans. It will be fatal if left unchecked. If what you have IS pinched mantle, you need to do a FW dip on the clam. It has been many years since I last dealt with PM so I don't remember how long of a dip is required. I'll try looking it up and posting back but in the meantime that is something you can look up too.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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