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Calcium a bit high but everything else looks good from a water quality standpoint.Listing parameters would help.
Thank you so much!It's usually due to over intensifying the lighting or overdosing 2 part Alk and Cal. Ask yourself if you've changed anything of these 2 things. If so, then change it back, lol. I would double test your Alk and Cal again today to see where you stand. Also test for magnesium and salinity. If your Alk is high along side your Cal and magnesium then you might need to take out some tank water and replace it with RODI. First, check salinity to see if reading is at about 1.026. I like to use a 16oz Solo plastic cup to measure each set. I would do a few sets slowly then again in a few hours and again at night.
Those yellow things might be just the polyps shrunken inside, I can't tell much from here but good luck. You had those corals for a long time. It would be a bummer to see them go down hill.