First few weeks you will test every day to check levels and see what you need to compensate in dosing. Try to test at same time so you know daily usages. After you get it figured out, you really only need to test once a week or so just to confirm everything is staying at level and even then usually only KH. Stay above 7.5. Always test after a water change. You might have to skip a dose or two because both KH and CA tend to run high in the new water. Also, dose kh in the morning before lights. some additives can spike ph if added during lighting period.