Hey guys. Here's a pic of a top down view..some of the colors on a couple corals might look weird, but I tried to get the colors on the coral in question to be as best represented as possible here. I have a large piece of red Monti cap. You can see some lightening of the flesh right in the center of the coral. Spot isn't full white, but the lightening is noticeable. I noticed this just tonight, didn't notice anything earlier today or yesterday. Params: Temp - 79.5 SG - 35 pH - 8.0 dKh - 8.5 Ca - 500 Mg - 1340 (I dose B-Ionic, and I calculated my dosing a while ago. Ca levels have always been kept/targeted 460, I cannot explain why level has risen to 500, and I haven't even dosed today yet.) Also, I saw a bit of "diatom" looking algae growing on my purple Monti cap..I had to blow it off and some of it sticks. This is only noticeable just tonight. A little of the same on the large red Monti cap in question, and a trace on my sunset Monti as well, but none was found on any other Monti cap in the tank. Worth noting, all three Monti with this condition are in direct path of MP10 set to 40% max reef crest mode. The other Monti located elsewhere in tank exhibit no symptoms. Thanks for any insight!!