A few weeks back at a frag swap I picked up a beauty of a clam. It was a 21/2 inch blue teardrop crocea. Got it acclimated and into my tank. It was doing fantastic for 3 days. Fourth day, I woke up to see it being eaten by a whelk, which I thought was a nasarrius snail when I got it. Needless to say, my clam is no more and the whelk is looking for a new home. I desperately want a clam in that tank so I want to be fairly sure I have nothing else that will munch on a clam. My inhabitants include a large mystery snail, several chitons, nerite, cerith, and astrea snails. There are also 4 or 5 blue legged hermits. I also have a coral banded shrimp. Are any of these clam predators? Thanks!