this is the 5th week of flowering and starting the 4th the pe express huge plant started yellowing an loosing all it's leaves rapidly i changed the water and the ppm is at 800 i have on vho light in my tent and also a 600hps light here are the pics can you help solve and the problem this is a hydro set up 20 gal res View attachment 1600101View attachment 1600102View attachment 1600103View attachment 1600105View attachment 1600106View attachment 1600108View attachment 1600109