I have a freedom filter, and Ehiem pro2, plus powerhead 1200/600/400
MH lights and water change every 2 weeks. with RO/DI water
Since adding my freedom filter they have been running at zero, before adding the freedom, they ran 10-20 but no higher. all other water is 0 cross the board. the ones that should be that is. I also test 1 time a month, inbetween water changes