I battled low Ph (like 7.9 or lower) for quite awhile I always felt I had excellent water flow/oxygenation, and a low bio load. So I looked at other causes like my calcium reactor, water quality, etc. Nothing I did fixed the problem, and adding chemicals to the water is only usually a temporary solution.
Anyways what solved my problem was just using a small air pump with a wooden airstone in my sump and it drastically raised by ph to 8.5 over the course of several days.
So look at your water flow/ oxygenation.
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