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It is a sponge, not a coral.
Where was the picture taken?
is that normal ? do the worms live in there or do they eat/take it over ???Those are commensal tube worms growing on a vase type sponge.
Thanks in Thailand right around here
https://www.google.ca/maps/@12.5743067,100.960112,12z
---------- Post added December 14th, 2014 at 04:43 PM ----------
is that normal ? do the worms live in there or do they eat/take it over ???
At first I thought it was coral with there guts out to feed ( blue planet coral reef section ) but just didn't look right and it was the middle of the day