Update
Thank you guys for all your thoughts. I am now running the tank with Kalk and CaCl2 solution additions only. The Alk dosing pump is still unplugged. The Ca levels are good (400-420) and the Alk is somewhat stable too (8.6-9 dKH).
Yesterday I checked nitrates and phosphates too and they were both zero. I did notice that other acro colonies are STNing from the base up. I just wish I knew what is causing this. Watching colonies STN helplessly is painful....
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