I have just added one eb and flow system and the light mover to try to increase yield. I dont have a ppm meter and I don't understand ppm's anyway. I have just been adding the neuts in the amounts listed above changing res water and neuts every monday. I have used this recipe for a year minus the light mover. I only flower in the tent. timer is always on 12/12. I veg in another area under t-5 flourecents. In veg the lights are on 24/7 approx 8 weeks then move them into flower on 12/12. The biggest colas im getting are only a few grams and im getting like 3/4 oz to 1oz off each plant and the plants are good size finishing around 40" tall lots of bud sites but buds dry are the size of marbles or a little bigger. Taste great looks great smokes great very powerfull just low yield. Thanks for the help