I also put a layer of granulated rockwool ( Floc ) at the bottom of each pot to allow me to flood and drain the coco without having coco make a mess of my flood and drain systems reservoir.
Before I bothered to actually buy ec.tds. and Ph meter. Lol my Ph was above 7. No good for flowering.received nuts lockout.
Ph down to 5.8 every time now.
Check run off every water. To keep track.
if I could put them right from my phone to here I woud but you have to go through that whole fucking process which I dont have time for ...............