All I am a little stunned at the fact that my knyas are dying. It's strange all parameters are normal, iodine, I add trace elements in my water changes , calcium ,lighting has always been fine. I can't seem to get them back to health. I've also noticed the other coral isn't as helathy as it used to be? Is there something I can add that will help? Ph salinity temp is all fine do is calcium I'm stumped I have changed a thing. All of the fish , inverts and mushrooms, polyps are happy. Could Cyanobacteria do this? I do have some inthe tank. Last water check phosphates were 0