Hi everyone. I’m within my first year of reefing and trying to tighten up my chemistry. I know we do not want swings in our numbers, but I do not know what’s acceptable and what is not. I am doing everything manual for now. For example, if I have 7.8 dkh one day and two days later have 7.4 dkh, is that normal is that considered a drastic swing? Granted I did a 10% water change right before the second test. I normally do the test before a water change.