No coincidence here, pinched mantle is though to be brought on by a protozoan similar to Perkinsus olseni .
Cleaner wrasses bites @ Clam----> Clam becomes stressed---> Immune system becomes compromised---> Protozoan now has the chance to grow----> Both clams get pinched mantle---> Marko does a fresh water dip---> Problem solved---> Marko is free to troll other posts on Canreef.