Whats wrong with my bubble coral?

[skipb1956]

My tank has been running for about a year and a half. I have had this bubble coral since the beginning.
nothing new added or changed for quite awhile.

 

[Frop]

+1 still alive. Idk anything about these.

 

[Frop]

http://successfulreefkeeping.com/learn/about-corals/what-your-coral-needs/#B

This one says bubble corals need to be fed at least once a week.