It's difficult to make generalizations because there are so many variables. For example my vortech is mounted half way down the tank and is aimed between some rocks. It might be that 20% reduction is more significant than if I had it closer to the top with more open placement.

I will post another graph later showing another change I made earlier in the week.

I am not routinely dosing this tank with anything. About the only thing I do is change water every few weeks.