It seems that over a week span my ph swings from 8.25-8.35 [day -night] to 8.35-8.45 then back and has an impact on alk consumption. I use dosing pumps so when consumption decreases in the low range and I am dosing for consumption in the high range it concerns me about an alk spike. All my sps go into grow mode in the high range.
That ph is fine, think more in terms of photosynthesis and alk and ca are being consumed because of it. Ph usually dips a bit at night (less photosynthesis) and higher during the day