Here are the latest photos during water change last night:
I had to remove some branches from the blue tip acropora in the first pictures as it started to smother the blue tip Acropora carduus (?), causing browning of its tissue due to shade.
Latest water parameters:
SG = 34.5 ppt
KH = 7.55 dKH
Ca = 420 ppm
Mg = 1325 ppm
Iodide = > 0.6 ppm
Iodate/molecular iodine = not measured
NO3 = < 0.2 ppm
PO4 = no longer measured