I also run what looks like the same thing as you I have four five gallon buckets with a 6-in net pot on top I don't have issues with light I use the hydroguard also seems to work right well I don't know anything about the ppms that all sounds like Chinese to me I just worry about my pH I try to keep it betweena 5.5 and 6.5 I use Lotus nutrients once it goes into flour I have to cut back I add 4 gallons of water and only mix for 3 gallons I have two autos Royal and I'm 10 weeks into a 17 week feed schedule

My mistake I'm 10 weeks into a 14-week feed schedule I also have two photos and the same nutrients Lotus I just flipped them to a 12-hour schedule they're in my 4x4 my autos and my clones first attempt are in my 4x8