[jdm01]

I have a 90g reef tank that has a number of LPS in it right now. I am getting ready to add coral, but have a question about my cup coral. I am in the process of losing an encrusting pagoda. Its skin has large holes in it and it is receding. The polyps look okay, but the skin has been damaged. The cup has one small hole in the skin that I can see, but its polyp extension is outstanding. In the year I have owned the coral it has never looked better. Any ideas what might be causing the damage to the "skin"? i am trying to resolve this and a water chemistry problem before I add any new coral. Phosphates and nitrates are still a little high - I think.