[Seriak]

Ok, so I have had a Maxima for over 2 years. It survived my coral die off a year ago and it was doing great. Well last month, I went away on vacation and when I returned the clam was picked clean. Obviously it died and the other inhabitants took care of the cleanup for me, but I cannot figure out what went wrong. No fish changes in the last few months. I did add a melanarus a few months ago, but he didn't go near it and I heard they don't. So can anyone guess why it died? All other SPS and LPS were and are still doing fine. All parameters below, but nothing out enough to get me worried. The reason I ask is the Clam discussion at Concepts and I am wondering if it should risk another in the same tank.

Alk 8.0
CA 450
Mg 1250

If the person feeding the tank dropped the pellets into the clam, would this cause issues. I don't mean on purpose, I just mean a few fall into the clam.

Any other ideas?