Mystery Clam Death

[Nicole8ca]

Hi,

I've had this clam for almost two years and if it's not dead it's dying. Calcium is 425, Nitrate zero and Ammonia is zero. I haven't addded any new fish that may be picking on it and everything else seems to be doing fine (anemones and fish).

Can anyone think of something else I should be checking before I lose something else?

Thanks!
Nicole