Couple of observations. From the first shot, your bleaching started at the end that is away from the lights (right side). Also From the full tank shot, it seems to me that cap is in a bit of shade. Maybe it is play of light on your pic, but to me it looks that the ca is in the darkest corner of your tank, so I would not contribute the bleaching to the lights.
Now, on the first pic, there are small white filaments protruding from the right side middle of the coral. Have you observed them before? They do not look like hydroids, though thy could be algae. To me, they look more like strands of coral tissue left after breaking he coral. Have you by any chance scrapped or injured that coral in any way while cleaning the glass, fixing rocks placing other corals, etc? Caps are very, very fragile. If you have told us that you have just mounted the coral a week or so ago, then I would say that it was simply dying from injuries and possible infection from handling. But to be for two months like that, it is a bit strange. The rim on the top, is that a new growth? After two months, it should have exhibited at lest some sign of growth.
Can that that Xenia, in front of it, touch it in any way? It looks like it can't but just make sure.
Now, on the first pic, there are small white filaments protruding from the right side middle of the coral. Have you observed them before? They do not look like hydroids, though thy could be algae. To me, they look more like strands of coral tissue left after breaking he coral. Have you by any chance scrapped or injured that coral in any way while cleaning the glass, fixing rocks placing other corals, etc? Caps are very, very fragile. If you have told us that you have just mounted the coral a week or so ago, then I would say that it was simply dying from injuries and possible infection from handling. But to be for two months like that, it is a bit strange. The rim on the top, is that a new growth? After two months, it should have exhibited at lest some sign of growth.
Can that that Xenia, in front of it, touch it in any way? It looks like it can't but just make sure.
