Started to feed gradually (that was wrong, should start to feed at least 3ml/l of base) from 1ml/l to 4ml/l at the end of the week 3.
Runoff EC was very low (0.4EC) and pH too high (6.7) Adding more nuts solve this, now it is more stable (EC 0.8 pH 6.2).
Still using CalMag foliar but got some burns, applied it too early (20 min before lights off)
Anyway the growth is vigorous.