It was acquired from a local reefer. Grown from about 2.5” to now 6”. I have not had any clams for about 3yrs. It seems to be better the past few days. Probably/hopefully only irritated from the move.
How is he now. If it is PMD, it will not resolve and just getting worst. If it is gone now, then the mantle just got irritated from some transient cause.