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So I was on the right track already. I searched the thread for "pH" but didn't find the answer.The daily pH swing
I know that pH influences the ORP. Can this be calculated for our tank water?
I like dichotomous explanations: If not only the pH would be responsible for the full ORP swings there would be another paradoxon: While the corals and algae produce oxygen (and the pH rises) the ORP drops.