The 2nd most important thing is to monitor pH. I think ideal is 7.2 to 7.8
Once you get familiar with the pH tendency to go up or down, you can fine tune it some. For example, mine wants to go up, so when I see it going above 7.8, I add MA to target 7.5. If I notice I am having to add MA more often, then I will target 7.2 a couple of times. This will get my TA down just enough to get into its sweet spot.
Hope that helps.
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