So far, so good.
Started on 05/11 to add very small amounts of nutrients to the water, with ph around 6,5.
Edit: I started with the PK13-14 to early, my mistake, not much was added. I will water the next days with pure low ph water.
Edit2: I also have supplemental Mars Hydro lights, next to the SP-3000; 2x60cm UVA-light @ 365-370nm and 2x60cm 'deep red' (not infra) @ 660nm.
From around week 3, I will start some UVA for 1min/h, instead of 5min/h. The 'deep red' will be used at late flowering, but active time will be half the time as advised (to start with). Also thinking of using the deep red for example; 10min/h or 15min/h , instead of the same as the main light cycle.
Edit3: The untagged solution is 'Mycorrhizae' (as uncut as I could get) from R&R Shop SRL.