Help! My clams are dying one by one and I cannot find a cause. Since its one at a time, I would think its some kind of bug or worm, but I have looked both day and night and I'm not finding anything. They look fine one day and then I wake up the next morning and a new one looks wilted and sucked in and within a day or two, hes gone. I have 6 clams and really don't want to loose them all! thanks