Hi,
I run a dual stage calcium reactor and it has a pH of around 8.3. It is fairly steady and I run my macroalgae tank/refugium at 24/7.
I would double check that the pH measurement is true since there have been some cases that the pH probe or test kit was faulty.
Low pH is not necessarily bad, but it can lead to cyano or algae blooms if the conditions are right (such as high dissolved organics).
- Victor.
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