Personaly I have never gone above 1.5 ATRAIN or 1 mill of supplements and if you look at my grows the tips area always brown still running a little hot at 1.5 but I water every day day and half. That plant in my pic never went over 1.5 or 1 mill of supps. just to let you lnow. I use pro cal which has a relatively high npk at day 30 I add the cal magand being that I grow under led so far i have needed it everytimeWatered this morning just before lights out. Day 19 and I have moved to 1.5ml/L grow / micro / bloom as well as 1ml/L vodoo juice and B 52.
If they look good on day 21 I'll go to 2ml/L across the boardView attachment 455702