PPM has been rising gently (was 550 last time I checked), while pH has been falling (6.0), over the past few days, so I added water yesterday to even it out. Noticed first pistils on a few nodes today, so I'm pretty excited. So far I haven't seen any nute burn except on two leaves on my biggest AK, so I'm thinking about bumping up the nutes a bit. More pics will be coming Friday, and I'll update with definite PPM and pH.