RO vs Tap Water, I started out using tap water, but now use RO. Tap water is generally treated with floride or florine. You have to check with your water company as to which is added to your drinking water. I have read that floride will evaporate or bubble off, as will the added chlorine. Florine on the other hand does not evaporate off the water and is harmful to your plant. I switched to RO water just to see if it made any differance, and in my case, it made a world of difference. Faster growth and less problems. I grow hydro in ProMix, AN with RO and LED. I don't use the pH Perfect, but Jungle Juice which is way cheaper and does a great job. I don't mind manually adjusting pH, that way I get it where I want it. I balance my pH feeds to 6.3. I have to add CaMg with every feeding starting from day one. On my last grow, a Cream of the Crop Cash Crop, I was up to 2 1/2 ml/L by the end of the grow. You usually do not see Ca or Mg problems show up until flowering starts. It is pretty hard to OD your soil with CaMg. Your plants have great color, they appear to have everything they need to kick into stretch which should be anytime now. I'm going to follow along, I am just starting a Dr Krippling AK-47 called The Smokin Gun. What is the breeder of your AK?