I hope somebody will be able to help me. I went home last night and noticed that part of my montipora undata looked like it was peeling away.You can see the white underneath. The part that's peeling sways when water passes over it.I know it's hard o explain without pics but I will take some tonight and try to post later.Can't now due to the fact that I'm at work.I have a Current 150watt 14k bulb with two pc(96w,50/50) light fixture.Tank is a 46bow. I have a refugium with 2reactors (1phosguard &1carbon) attached to it.I also have a aqua c skimmer.I use rodi and filters and membrane are checked and changed religiously.Filter sock is used also.Water changes are done once a week.I checked my levels and found only the nitates to at around 5ppm.Calcium levels were at 420.All other levels were 0ppm.Temp was 79F.The moti is placed midways to top in tank. Is it bleaching and if so why.All other sps are fine.I need help.