heteropsammia cochlea...the walking coral

Here's a pic. It's called a walking coral but so far it just moves around in a small area. There is a Sipunculid worm living inside that keeps the coral from being covered in substrate.
IMAG0154.jpg
 
These guys are relatively new to the hobby. I think first imports on the was about 3 years ago. The only thing I've head is that the worm has died on people but the coral is pretty hardy.
 
Next time I'm digging around in my tank I'll take a picture of the bottom. There's a perfectly circular hole where the worm comes out.
 
Yep looks like a small Rhizo. Only about an inch long. I've read that while they are usually a single polyp, there are some with two polyps, or even a small cluster of polyps.
so the worm & coral are symbiotic? What happens when the worm dies? It looks a bit like my Rhizo.
 
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