Many years ago, I had an SPS die in my 29g reef. I was told that it likely died due to boring algae. Unsure what they meant by that, I asked for a little more information since the coral never had any type of algae on it while it was alive. I was told that the skeleton being green was an indication that a type of algae was within the skeleton itself, that it had bored its way into the coral and weakened the living tissue. The most common cases of boring algae are when a system has very high ...