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That is not completely accurate, and you are unwilling to digest that. So that was fun but will now give the thread back to opWhat I stated: "The pH would be influenced by CO2 levels, not alkalinity."
What I stated: "Alkalinity and calcium are consumed together so if one goes down, so does the other." Raising alkalinity wont decrease calcium levels unless alkalinity is consumed.
OP,
try to get more flow at tank surface with circ pumps to increase ph. As well with alk that low you probably should add some as described in the Randy article I linked above. Maybe dosing calcium is in order too, but don’t know because that info was not provided.
Dosing kalkwasser in an auto top off or by other means might be a good path for you, since it will not only do cal and alk in one cheap and easy product, but also help keep ph up. I would also recommend you check magnesium levels so you can rule that out as a culprit.
If that isn’t confusing enough for you will throw in when ph goes up corals will consume cal and alk faster. You should share some more parameters, more about your set up, and tell us how you’v been maintaining cal and alk til this point to get some better advice
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