I have been keeping mine for around 2-3 mths already and is still doing great now. I cannot really say I have successfully keep this species of scallop cos you all know they live for years in the wild!
wat I do know is that these scallops need tanks with good flow all around the tank and are best when you let them find their own spot( and hopefully stay there ) and now make them go to a place you like, we must always remember that it is the health of these animals that we should take pirority first and not the pleasure for us to view them or something like that.
and after them finding their spot, you need to provide them with regular amounts of plankton.