clam death

[ScubaGirl]

My squamosa clam has died.

The pyramid snails got to it and killed it. It was fine a couple of days ago with great reaction time so I am just stunned today to find the mantle all retracted and no reaction from the clam when it's touched. Upon turning it over, it was infested with tiny white pyramid snails. I had no clue, being a rookie at this (less than a year). I tried to scoop as much of the immediate substrate out as well. I just love clams and would love to have more in my tank but what should I do to get rid of/control these snails? I read that certain wrasses eat them? Your thoughts/experience with this? How often should I be inspecting the bottom of the clam in the future? I thought it was good to leave it alone to do it's thing and attach itself (in error!). How long do I need to wait before getting another one? What is the life span on these snails? What else do they host on?

I've been concerned about the loss of a couple of turbo snails lately. I've been blaming it on the blue hermits in the tank that have grown rather large. Would these snails go after them as well?

I love my tank and so far I've been pretty fortunate with some wonderful advice from the two LFS. This loss is hitting pretty hard though. I'm in there feeding corals, I could have easily looked at the clam while I was in there.