Well, left for a few days to go take care of my Dad, and came back to a stressed tank. PH dipped to 7.8, and the acropora receded really far back. Daily monitoring of PH and Calcium has brought back. Fighting purple cyano as well. So spend last night to 3am, installing the new sump that would fit reef octopus (was using an underated one as a temporary solution). That made a big difference.
Next on the agenda is to install the BRS doser.