hey man i read your threads some of them any ways was wondering if you could help me out a lil i have the aqua flakes a n b this is my first hydro grow i have a 20 gallon res like u lol kinda funny almost same as you in every way any ways i really need some advice if i were to run straight r/o water with the flakes during tall veg is where i am at now would i have to worry about the ppm an i have the ph controller thing working well but my plants have a few yellow leaves on the bottom could this b due to me over nuting it i followed what the instructions said but it was my first nut batch i read you have to use half the nutes for first batch so ya please get back to me on these things thank alot mike