How long have you had this SPS? From the looks of the pictures this coral has been starving and deteriating for a long time. I would have to say at least 3-4 months. From your picture, it looks like this coral was very vibrant purple/blue at one time. I would definately frag it, but more important is to find the source of the issue. I would guess that your alkalinity is not right. I would check that and ensure its in check. If it is, then you may ant to look at your other parms. What kind of light do you have?