Very nicely said my friend... So use pH 6.0 - 6.5, why so...? Dont they say to try to get as close to pH 5.2, that's the level Marijuana takes in as many different types of Nutrients as it can. I am also doing this all INDOOR under CFL's... Maybe ask your son about that little DWC project he did, because there is a lot that has to be done to a DWC setup... Its definitely not a water and walk away project, there is a lot of things that need to be monitored, changed, moved, clean, take care of... What is his trick then...?