Hi again everyone. So for the past few weeks my encrusting corals have been getting white patches on them. First I thought it was purple they were turning but I had an Ah-ha moment the other day. I turned up the whites and down the blue for like 45 seconds to look at the corals and saw the patches of discoloration were white and not purple. I had a concern it could be my new AI prime 32HD lights that Are only 48 days on the tank (which I also used the acclimation 30 day setting for them When Installed) so I dropped the levels a little and put Cool whites at 5 pct. only. My next concern was Alkalinity rising. But last night my new Hanna Phosphate and Alkalinty testers came In. I checked my water twice with each tester and got the same results both times on both tester. My Alkalinity is at 7. My phostphates are 0.70. In the past weeks using my old API kits I was getting anything from 7-10 on alk and 0-.50 On phosphates. So hopefully I’m one step closer to solving this problem. All my other corals including my birds nest which is SPS are doing well. It’s just the encrusting corals Favia, montiporia, burning banana that are Turing white In patches. Is the high phosphates Why this is happening?