I purchased this coal as a frag which at first seem to be dieting, but what was left I stuck to a rock and it grew and grew for about eight month. It started to over grow another coral so I broke of a bit and stuck it to the other side. As you can see from the photo it became a lively group. It was green by the way. Then suddenly it turned white. I have no idea what it’s called but have seen then growing in quite a few tanks at Lfs. Can anyone advise me as to why it died and what it’s called. All my parameter are within the Red Sea advisory. My latest Triton tests all came back fine?