awesome journal, I'm running a RDWC set up with 4 pots, Im about ready to flush, I know I run hydroguard and do not use a chiller and I run in the low 70 degrees with no issues. This is my first run, I can definitely improve on layout of my plants with a net system, (uneven growth) but all in all My girls are very healthy. I noticed in the flower phase they cannot handle a higher PPM nothing over 500. But just a FYI H202 will kill all bacteria even the "good" ones from the hydroguard. Do not use any H202 when using hydro guard, otherwise your wasting your time, also it takes some time for the h202 to disolve and go away. and for the PPM pen and PH pen you cant go wrong with the Blue lab.