Btw alk and ph vary with a clear relationship to the coral growth especially during photo period, thats why advanced reactors like dastaco have a photo sensor that dial down the alk during night. They had this long time ago before anyone. Then others started copying them...
I notice the same, high alk consumption during the photoperiod and little overnight. I have heavily stocked 120g SPS tank running a GEO618 calcium reactor. Wish I had a way to automatically adjust output throughout the day.
Overall I’m happy with the Alkatronic, it’s been running without issue for ~9 months. I’m heavily invested in Apex gear but I just didn’t have the patience to wait.