Marty
MOST reef aquarists have difficulty keeping their pH in the 8-8.3 range due to a variety of factors. Your cal rx is one factor but i don't think its the primary factor. The breakdown of organics in your system is another factors and so is the photosynthesis cycle that occurs during day/night time cycle. Your ph is quite normal for reef systems. You can add 8.3 kH buffers to your system but that will change your alk levels. I recommend using kalk in all your top off water via a kalk reactor if that can fit in your system. I was able to keep my pH in the 8-8.3 range when using this method. And if you wish to maintain 8 dkh, then adjust your calcium reactor accordingly if your dkh begins to creep up too high.
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