Thanks. I just did my first water change this morning. I'm going to be following Frank Wazeter/ADA method of daily water changes the first week, then every second day, second week, etc.
Regarding my fert dosing: I created solutions for "EI daily" as it's much easier for me to dose daily at the same time every day. I don't know if adding my daily dosing after water changes would be a waste of ferts or not. However I believe that the plants will benefit from the lean dose as the week progress.