I had mine for about 2 years, it was a great tank mate (although did not like to meet new mates when they were first introduced). Beautiful fish when it would swin in the open waters. Only problems I had was with the cleaner shrimp. The shrimp was his/hers and no other fish was allowed near. Very protective over the cleaner. Many angels tend to get protective over there cleaners from what I have been told.
Unfortunately I have not seen it poke out from the rocks lately and fear that time has taken over.