Interesting, I don't like my PH to fall below 8.0. usually runs 8.2 in the day. I do use a Aquavitro product called Balance occasionally when I see day readings below 8.0. This product is unique as it converts bicarbonate into carbonate. So it isn't just a PH buffer, which I don't use. Maybe see how it works for you?
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Red Sea REEFER 450
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