Very happy to see you haven't packed your tank to the walls with corals and have left room for growth! Your reef looks wonderful now and will fill in beautifully. Your adjustments now sound like the progression most reef tanks (and their keepers) go through just past the one-year mark as you re-balance the increase in demand from coral, fish, and algae growth with the resulting nutrient increases. This is how most reef keepers end up with a few storage totes of various reactors, media, and other gadgets. I think I still have bags of GFO and biopellets I should have given away years ago...
Are you using a simple system of pumping top-off water through saturated kalk in a reactor for that dosing? You mentioned the pH differences with the building sealed or windows open, have you evaluated an outdoor air source and CO2 scrubber for your protein skimmer as an additional pH booster?
Are you using a simple system of pumping top-off water through saturated kalk in a reactor for that dosing? You mentioned the pH differences with the building sealed or windows open, have you evaluated an outdoor air source and CO2 scrubber for your protein skimmer as an additional pH booster?