Wedding Cake, Barney's Farm, Feminized

Day 1: Week 5 starts with adding basic nutes on top of the "old" water. Also added "new" water to dilute the EC to 1.5 and that brought the pH up to 6.3. The plant itself is bushy and stubby, and for some odd reason I don't want to defoliate the huge and beautiful fan leaves. Let her grow like that for now. Day 2: EC was 1.5 but pH had risen up to 6.4. I brought it down to 5.9. There's an issue with low humidity. RH is around 35-40% and I don't wanna run my humidifier anymore because the mist has fine white chalky powder that clogs the air filter eventually. This is why I run two in-line duct fans and it is already high-time to run the bigger one since the CO2 baggie got opened. Day 3: Added water for about 3 l. EC 1.5, pH 6. Last day before flipping to 12/12. Day 4: EC 1.3, pH 6. First day in 12h darkness. Day 5: CalMag added 10 ml and fresh water added, EC 1,5 pH 6.3.