i know pH is the issue here.
all 3 previous grows - exactly same setup
just done res change 2 days ago - 2 days of plain water (0.1ec 6.2ph)
then i saw ph beeing like 5.5 which i thought was the time to add nutes - that has happened today
added 20ml aqua A , 20ml aqua B, 30 ml rhizotonic, 30 ml...