I wish I could get my camera to take a good pic because to me this is really bizarre.
Literally last night my clam was fine. Then today I'm walking by my tank, and much to my dismay, his shell is there, but he is GONE!

Actually I can see his "body" or whatever lying next to the shell, and there are lots of bristleworms around, obviously taking advantage of the free meal. But good lord. How did this happen overnight? :mad:
I don't know what other info you may need to diagnose this. I would dose the tank 2x a week with DTs Live Phytoplankton, and also Kent Marine Coral-Vite.
I've had this guy for more then 6 months or so, and yea it was my first clam so maybe I didn't know what to look for, but I didn't see any signs of distress. He was about midway up in the tank, under MHs, with perfect water quality.
This is just....weird. Especially since he looked totally fine last night.....wtf??
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125 Gal Reef. Born March 2002
FISH: Ocellaris Clown, Yellow Tang, Fairy Wrasse, Sand Star, Fuzzy Dwarf Lion, Mandarin Dragonette, Hippo Tang
CORALS: Green Striped/Red/Purple Mushrooms, Green Star Polyps, Yellow Toadstool Leather, Bubble, Frogspawn, 2 Hammers, Yellow Polyps, Open Brain, Ridge Leather, Various Zoas, Button Polyps, Kenya Tree, Colt, Elephant Ear Mushroom, Clove Polyps, Torch, Purple Clam, Rose BTA