I have a perplexing problem. Tips on my sps are losing flesh, it started in my new tank, which I chalked up to new lighting. I installed new LEDs and overlit the new tank, which caused bleaching to occur. Now it has spread to my other tank, which has had no changes for awhile. My calcium and alkalinity are within acceptable parameters (5 meg/l alkalinity and 500ppm calcium). pH is at 8.38 and went to 8.40 for a high today. Only SPS are affected, lps are fine for now. I sometimes see very fine filaments coming out of the polyps that are white and long, after that the coral starts to die at the top of the polyp and then spreads down the branch. It started with one coral and has spread through out the system. Could this be a disease?
Thanks for looking.