I'm pretty sure the Clam is Mort

Sooo he took a dive today and retracted. i don't really see his tube anymore and he is definitely separating and not light responsive. At which point is the little guy un recoverable? I feel awful. It's the first thing I've ever lost...

I am sorry to hear this Not much you can do but take em out once the clam starts to sepreate from the shell itself.I have kept my fatality and used the shells for other corals,then the cycle continues.